Some structures on an f-structure manifold U. C. Vohra; K. D. Singh — 1972 Annales Polonici Mathematici
On generalizations of pseudo-harmonic and pseudo-Killing vectors Muralidhar Prasad; K. D. Singh — 1970 Annales Polonici Mathematici
On some structures defined by algebraic equations U. C. Vohra; K. D. Singh — 1973 Annales Polonici Mathematici
On some strictly almost analytic vector fields in tangent bundles K. D. Singh; N. Srivastava — 1973 Matematički Vesnik