Articles discussing Vyadi
Max Muller's Introduction to the Rgveda-Pratisakhya
Vyadi and Vajapyayana
M. Hiriyanna · The Indian Historical Quarterly, 1938
“Vyadi and Vijapydyana were two grammartans older than Kiaryayana, as shown by પડ reference to them 10 his Varetika.'”
Grammatical Paribhasas of the Siddhahema System
J. M. Shukla · Sambodhi, 1976
Panini and the Rkpratisakhya