By L. D. Landau, E.M. Lifshits, L. P. Pitaevskii, E.M. Lifshitz (both of the Institute of Physical Problems, USSR Academy of Sciences, Moscow, USSR)
By R.G. Chambers
By A.C.Rose- Innes, E.H. Rhoderick, A.C. Rose-Innes
By Henry Pluckrose
By Orzel, Chad
By Michio Kaku
By David C. Cassidy
By ALAN MARTIN and SAMUEL A. HARBISON