Murrell, J.N. Valence theory / - 2nd ed. - London : John Wiley & Sons Ltd., 1974. - xv, 428 p. : ill. ; 21.8cm. Includes index ISBN: 0 471 62689 9 Subjects--Topical Terms: foundations of atomic theory.Electron in a constant potential.Hydrogen atom. Dewey Class. No.: 541.224 / MUR