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Isavasya Upanishadhil Sila Visesha Vishayangal
Article in Tamil http://acharya.org/ar/misc/iusvv.pdf
Article in Tamil http://acharya.org/ar/misc/iusvv.pdf
Book http://acharya.org/bk/pb/vu/hs.pdf
Book in Tamil http://acharya.org/bk/pb/Vyakhyanam/kathauvt.pdf
Upanyasam in Tamil by TCA Venkatesan https://srivaishnava.bandcamp.com/track/ramayana-thani-shlokam-31529-tamil
Book in Tamil http://acharya.org/bk/pb/Vyakhyanam/prashnauvt.pdf