2020 Series of Upanyasams in multiple languages by various scholars MP3 files available for download https://svlife.gumroad.com/l/iwbwx
Lokacharya Panchashat Commentary
New Book in English, by TCA Venkatesan Available as Kindle Book or Printed Book (in some countries) on Amazon
Guru Paramparai Vaibhavam
1987 Book in Tamil, by Ethiraja Ramanuja Dasar http://acharya.org/bk/pb/erd/gpv.pdf