References for Prthudakasvami
- V Mishra and S L Singh, First degree indeterminate analysis in ancient India and its application by Virasena, Indian J. Hist. Sci. 32 (2) (1997), 127-133.
- P K Majumdar, A rationale of Brahmagupta's method of solving ax + c = by, Indian J. Hist. Sci. 16 (2) (1981), 111-117.