Vorticity and electric current behind a shock wave in relativistic magnetohydrodynamics A. V. Gopalakrishna — 1983 Annales de l'I.H.P. Physique théorique
Discontinuities in an arbitrarily moving gas in special relativity A. V. Gopalakrishna — 1977 Annales de l'I.H.P. Physique théorique