by Jan J. Tuma and M. N. Reddy. by Jan J. Tuma and R. K. Munshi. by J. G. Defares and I. N. Sneddon. by Jan J. Tuma and Franklin Y. Cheng. by B. L. Sharma and R. K. Purohit. by Carl G. Johnson and Wm. R. Weeks. by P. Terpstra and L. W. Codd. by Joseph Zaba and W. T. Doherty.