References: terminal velocity

droplets:

• Gunn & Kinzer 1949 (J. Meteorology)
  "The terminal velocity of fall for water droplets in stagnant air"
• Simmel et al. 2002 (Atmos. Res.)
  "Numerical solution of the stochastic collection equation—comparison of the Linear Discrete Method with other methods"
• Thurai et al. 2021
  "Raindrop fall velocity in turbulent flow: an observational study"