In the early decades of the 20th century , Benoytosh Bhattacharya – an expert on Tantra and the then director of the Oriental Institute of Baroda – studied various texts such as the Buddhist `` Sadhanamala `` ( 1156CE ) , the Hindu `` Chhinnamastakalpa `` ( uncertain date ) , and the `` Tantrasara `` by Krishnananda Agamavagisha ( late 16th century ) .
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