1. Ram BallabhProc. Banaras Math. Soc., 1940,2, 70–79.
2. Prem PrakashGanit, 1954,5, 21–24.
3. Milne-Thompson, L. M.Theoretical Hydrodynamics, 1949 p. 325.
4. Durand, W. F.Aerodynamics Theory, 1935,3, 167.
5. Nemenyi, P. F.Advances in Applied Mechanics, 1951, p. 124.