1. Best k-digit rational approximation of irrational numbers: Pre-computer versus computer era;Sen;Applied Mathematics and Computation,2007
2. The Origin and History of Mathematics;Lakshmikantham,2005
3. H. Eves, An Introduction of the History of Mathematics, 5th ed., Saunders College Publishing, Philadelphia
4. The Saga of Mathematics: A Brief History;Lewinter,2002
5. Computational Error and Complexity in Science and Engineering;Lakshmikantham,2005