Mathematical Analysis of Disphenoid by H C Rajpoot
HCR's Theory of Polygon (Solid angle subtended by any polygon at any point in the space)
HCR's Theorem (Rotation of two co-planar planes, meeting at a common edge, about their intersecting straight edges )
HCR's formula for regular spherical polygons
Mathematical Analysis & Modeling of Pyramidal Flat Containers, Right Pyramids and Polyhedrons (Applications of HCR's Theorem and Corollary)
Harish Chandra Rajpoot