Mumukshuppadi by Pillai Lokacharyar
Vyakahyanam by Manavala Mamunigal
Arumpadham by Suddhasattvam Doddaiyangar & Suddhasattvam Embavaiyangar
1890 Book in Mani Pravalam
http://acharya.org/bk/pb/Vyakhyanam/mmpva.pdf
Mumukshuppadi Vyakhyanam and Arumpadham