diff --git a/docs/adr/001/operators.ipynb b/docs/adr/001/operators.ipynb
index 24419370..41d2f410 100644
--- a/docs/adr/001/operators.ipynb
+++ b/docs/adr/001/operators.ipynb
@@ -265,8 +265,8 @@
     "        return self.opn(self.op1.eval())\n",
     "\n",
     "\n",
-    "asMagicNumber = (\n",
-    "    lambda x: x if isinstance(x, MagicNumber) else Constant(x)  # noqa: E731\n",
+    "asMagicNumber = lambda x: (  # noqa: E731\n",
+    "    x if isinstance(x, MagicNumber) else Constant(x)\n",
     ")\n",
     "asMagicNumber(2).eval()"
    ]
diff --git a/docs/conf.py b/docs/conf.py
index 8892b218..5305be85 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -266,6 +266,7 @@ def get_minor_version(package_name: str) -> str:
 linkcheck_ignore = [
     "http://127.0.0.1:8000",
     "https://atom.io",  # often instable
+    "https://doi.org/10.1002/andp.19955070504",  # 403 for onlinelibrary.wiley.com
     "https://github.com/organizations/ComPWA/settings/repository-defaults",  # private
     "https://github.com/orgs/ComPWA/projects/5",  # private
     "https://github.com/orgs/ComPWA/projects/6",  # private
diff --git a/docs/report/017.ipynb b/docs/report/017.ipynb
index b39c530e..5f570ba8 100644
--- a/docs/report/017.ipynb
+++ b/docs/report/017.ipynb
@@ -597,13 +597,15 @@
     "    T1: T0 / 3 - r * sp.cos(theta),\n",
     "    T2: T0 / 3 - r * sp.cos(theta + 2 * sp.pi / 3),\n",
     "    T3: T0 / 3 - r * sp.cos(theta + 4 * sp.pi / 3),\n",
-    "    T0: m0**2\n",
-    "    + m1**2\n",
-    "    + m2**2\n",
-    "    + m3**2\n",
-    "    - (m2 + m3) ** 2\n",
-    "    - (m1 + m3) ** 2\n",
-    "    - (m1 + m2) ** 2,\n",
+    "    T0: (\n",
+    "        m0**2\n",
+    "        + m1**2\n",
+    "        + m2**2\n",
+    "        + m3**2\n",
+    "        - (m2 + m3) ** 2\n",
+    "        - (m1 + m3) ** 2\n",
+    "        - (m1 + m2) ** 2\n",
+    "    ),\n",
     "}"
    ]
   },
diff --git a/docs/report/020.ipynb b/docs/report/020.ipynb
index 5ed637f9..4d02b171 100644
--- a/docs/report/020.ipynb
+++ b/docs/report/020.ipynb
@@ -552,8 +552,9 @@
    "outputs": [],
    "source": [
     "initial_parameters = {\n",
-    "    R\"C_{J/\\psi(1S) \\to {f_{0}(1500)}_{0} \\gamma_{+1}; f_{0}(1500) \\to \\pi^{0}_{0} \\pi^{0}_{0}}\": 1.0\n",
-    "    + 0.0j,\n",
+    "    R\"C_{J/\\psi(1S) \\to {f_{0}(1500)}_{0} \\gamma_{+1}; f_{0}(1500) \\to \\pi^{0}_{0} \\pi^{0}_{0}}\": (\n",
+    "        1.0 + 0.0j\n",
+    "    ),\n",
     "    \"m_{f_{0}(500)}\": 0.4,\n",
     "    \"m_{f_{0}(980)}\": 0.88,\n",
     "    \"m_{f_{0}(1370)}\": 1.22,\n",
diff --git a/tox.ini b/tox.ini
index 062be941..8cf07ab3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,21 +2,13 @@
 envlist =
   doc,
   sty,
-passenv = PYTHONPATH
 skip_install = True
 skip_missing_interpreters = True
 skipsdist = True
 
 [testenv:doc]
-description =
-  Build documentation and API through Sphinx
 allowlist_externals =
   sphinx-build
-passenv =
-  EXECUTE_NB
-  GITHUB_REPO
-  GITHUB_TOKEN
-  READTHEDOCS_VERSION
 commands =
   sphinx-build \
     --color \
@@ -24,18 +16,15 @@ commands =
     -TW \
     -b html \
     docs/ docs/_build/html
+description =
+  Build documentation and API through Sphinx
+passenv = *
+setenv =
+  FORCE_COLOR = yes
 
 [testenv:doclive]
-description =
-  Set up a server to directly preview changes to the HTML pages
 allowlist_externals =
   sphinx-autobuild
-passenv =
-  EXECUTE_NB
-  GITHUB_REPO
-  GITHUB_TOKEN
-  READTHEDOCS_VERSION
-  TERM
 commands =
   sphinx-autobuild \
     --open-browser \
@@ -55,16 +44,13 @@ commands =
     --re-ignore docs/_build/.* \
     --watch docs \
     docs/ docs/_build/html
-
-[testenv:docnb]
 description =
-  Build documentation through Sphinx WITH output of Jupyter notebooks
-passenv =
-  GITHUB_REPO
-  GITHUB_TOKEN
-  READTHEDOCS_VERSION
+  Set up a server to directly preview changes to the HTML pages
+passenv = *
 setenv =
-  EXECUTE_NB = "yes"
+  FORCE_COLOR = yes
+
+[testenv:docnb]
 allowlist_externals =
   sphinx-build
 commands =
@@ -74,36 +60,36 @@ commands =
     -TW \
     -b html \
     docs/ docs/_build/html
+description =
+  Build documentation through Sphinx WITH output of Jupyter notebooks
+passenv = *
+setenv =
+  EXECUTE_NB = yes
+  FORCE_COLOR = yes
 
 [testenv:docnb-force]
-description =
-  Execute ALL Jupyter notebooks and build documentation with Sphinx
 allowlist_externals =
   sphinx-build
-passenv =
-  READTHEDOCS_VERSION
-  TERM
+commands =
+  sphinx-build -nW --keep-going -b html docs/ docs/_build/html
+description =
+  Execute ALL Jupyter notebooks and build documentation with Sphinx
+passenv = *
 setenv =
+  FORCE_COLOR = yes
   FORCE_EXECUTE_NB = yes
   PYTHONHASHSEED = 0
-commands =
-  sphinx-build -nW --keep-going -b html docs/ docs/_build/html
 
 [testenv:jcache]
-description =
-  Inspect Jupyter cache
 allowlist_externals =
   jcache
 changedir = docs/_build
 commands =
   jcache {posargs:notebook list}
+description =
+  Inspect Jupyter cache
 
 [testenv:linkcheck]
-description =
-  Check external links in the documentation (requires internet connection)
-passenv =
-  EXECUTE_NB
-  READTHEDOCS_VERSION
 allowlist_externals =
   sphinx-build
 commands =
@@ -112,23 +98,27 @@ commands =
     -T \
     -b linkcheck \
     docs/ docs/_build/linkcheck
+description =
+  Check external links in the documentation (requires internet connection)
+passenv = *
+setenv =
+  FORCE_COLOR = yes
 
 [testenv:nb]
-description =
-  Run all notebooks with pytest
 allowlist_externals =
   pytest
-passenv =
-  EXECUTE_NB
 commands =
   pytest --nbmake {posargs:docs}
+description =
+  Run all notebooks with pytest
+passenv = *
 
 [testenv:sty]
-description =
-  Perform all linting, formatting, and spelling checks
 allowlist_externals =
   pre-commit
-setenv =
-  SKIP = pyright
 commands =
   pre-commit run {posargs} -a
+description =
+  Perform all linting, formatting, and spelling checks
+setenv =
+  SKIP = pyright