Robuta

https://www.aanda.org/articles/aa/abs/2014/11/aa23647-14/aa23647-14.html
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
probability distributionsurface densityfunctionmass
https://brilliant.org/wiki/continuous-random-variables-probability-density/
The probability density function or PDF of a continuous random variable gives the relative likelihood of any outcome in a continuum occurring. Unlike the case...
continuous random variablesprobability density functionpdfbrilliantmath
https://www.upgrad.com/blog/introduction-to-probability-density-function/
Discover what is probability density function, its formula, properties, applications, and real-world use cases. Learn with examples and best practices.
probability density functioncomplete guide