In Narayana Suktam, there is a phrase: “sa: brahma sa: shiva sendra sokshara parama svarAt”. There is a tendency for some to add a ‘sa: hari’ before the ‘sa: indra’, to make a claim that Narayana is different from Hari
Sri Ramanujan 358
March 1978 Issue http://acharya.org/mag/sr/sr358.pdf
Saptha Kaadhai Vyakhyanam
1916 Book in ManiPravalam by Pillailokam Jeeyar http://acharya.org/bk/pb/plj/skv.pdf
Ramayanam and Rahasya Trayam
Talk in English by TCA Venkatesan https://srivaishnava.bandcamp.com/album/ramayanam-and-rahasya-trayam-english
Tarka Shastra Nirupanam – A Thesis on Tarka Shastra
1934 treatise in Sanskrit by P B Annangarachariar Swami http://acharya.org/bk/pb/pba/tsn-pba.pdf