Ram Shankar Tripathi and Thakur Sain Negi are scholars who collaborated on the 2001 critical edition of the हेवज्रतन्त्रम् (Hevajratantram), a foundational text of late Indian esoteric Buddhism. Their edition, published by the Central Institute of Higher Tibetan Studies, Sarnath, also includes the Muktavali Panjika, a significant commentary by the Mahapandita Ratnakarasanti.