by Gupta, R L, Khera, H C
Published in Journal of the Indian Medical Association (16.10.1966)

by MOHAN, M., KHERA, H. C., MITTAL, S. G., SIRIVASTAVA, A. K.
Published in Current science (Bangalore) (05.04.1977)

by Khera, H., Ilyas, M., Bemmel, V.
Published in Proceedings of SOUTHEASTCON '94 (1994)