He also published an invited review article on this subject as a single author in Reports on Progress in Physics in 1988.

He has carried out research in the development of a novel computational formulation for calculating the total energy of solids based on quantum mechanics.

An international society on this field of research was formed around 1990, and its 16th annual meeting was held in Trieste, Italy, in January 2013.

A similar society was formed in Asia in 1998 and he has played a key role in its birth and continued growth.

He has been a Fellow of the American Physical Society since 2007, and a Foreign Associate of the National Academy of Sciences of the USA since 2011.