Hamsa-avatara Answers Questions of Sons of Brahma

http://www.astrojyoti.com/hamsagita.htm
https://en.wikipedia.org/wiki/Hamsa_Gita
https://www.youtube.com/results?search_query=Hamsa+avatara 
http://spiritual-minds.com/Gita_files/Hamsa%20Gita/HamsaGita.pdf
http://www.messagefrommasters.com/bhagavadgita/hamsaavatarauddhavagita.htm
https://www.slideshare.net/search/slideshow?searchfrom=header&q=hamsa+gita