A very well researched article written by my friend and guide Dr. T R Aravindhan (who's been guiding my rAgA essays also).
http://guruguha.org/blog/2019/08/24/col ... B9%85ga-s/
Highlights :
1) How the definition of bhAshAnga ragas has changed over time
2) The various forms of bhAshAnga ragas
3) The role of the anya swara and the question of which is actually the anya swara - and the bhAshAnga ragas without anya swaras.