Ulrich, Henri, 1925- Cycloaddition reactions of heterocumulenes. - New York, Academic Press, 1967. - ix, 364 p. illus. 24 cm. - Organic chemistry; a series of monographs, v. 9 . LCCN: 66030110 Subjects--Topical Terms: Cumulenes.Ring formation (Chemistry)Formação de anel (Química) LC Class. No.: QD305.H7 / U55 1967 Dewey Class. No.: 547