Cosine Similarity

https://www.sciencedirect.com/topics/computer-science/cosine-similarity#:~:text=Cosine%20similarity%20measures%20the%20similarity,document%20similarity%20in%20text%20analysis.

https://sysblok.ru/glossary/chto-takoe-kosinusnaja-blizost/

https://datafinder.ru/products/kosinusnoe-shodstvo-v-mashinnom-obuchenii

https://sky.pro/wiki/python/raschet-kosinusnogo-skhodstva-dvukh-spiskov-chisel-v-python/