On the concepts of balls in a D -metric space. Naidu, S.V.R.; Rao, K.P.R.; Srinivasa Rao, N. — 2005 International Journal of Mathematics and Mathematical Sciences
On the topology of D -metric spaces and generation of D -metric spaces from metric spaces. Naidu, S.V.R.; Rao, K.P.R.; Srinivasa Rao, N. — 2004 International Journal of Mathematics and Mathematical Sciences
The motion of a falling particle in a Schwarzschild field K. N. Srinivasa Rao — 1966 Annales de l'I.H.P. Physique théorique