The neurobiology of love - Zeki - 2007 - FEBS Letters - Wiley Online Library
https://febs.onlinelibrary.wiley.com/doi/full/10.1016/j.febslet.2007.03.094

The neuroethology of friendship
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045505/

The Neuroscience of Rejection: Why it hurts and what to do about it
https://medium.com/@joeldavies_7078/the-neuroscience-of-rejection-why-it-hurts-and-what-to-do-about-it-1075d39abf47

Pinpointing loneliness in the brain
http://news.mit.edu/2016/neurons-loneliness-brain-0211