Talk in Tamil, by TCA Venkatesan, on some of the interesting and informative use of Tamil words & descriptions by Periyazhvar in his Thirumozhi. https://svlife.gumroad.com/l/ixgre
Azhvar Vishayam
2015 Book in Tamil By Sri U Ve Desur N C Srivatsankacharia Swami http://acharya.org/bk/pb/dncs/av.pdf