The conservation of orbital symmetry / by R. B. Woodward and R. Hoffmann. Woodward, R. B. (Robert Burns), 1917-1979. Hoffmann, Roald, joint author. Conservation of orbital symmetry. QD461 .W75 523.63 WOC Includes bibliographical references. Weinheim ; Bergstr : Verlag Chemie, 1970. 1970. 1970 Text 177 p. : eng