The 2-Adjugate mod 2 Class of Designs. - M. N. Vartak; G. A. Patwardhan (J. Comb. Theory A, 1971)

On Some Constructions of Modular Hadamard Matrices. - Surya Prakash Rao Hebbare; G. A. Patwardhan (J. Comb. Theory A, 1976)

Switching invariant two-path signed graphs. - M. K. Gill; G. A. Patwardhan (Discret. Math., 1986)