Collingwood, E. F. The theory of cluster sets / by E. F. Collingwood and A. J. Lohwater - Cambridge : Cambridge U. P., 1966 - 211 p. ; 23 cm. - Cambridge tracts in mathematics and mathematical physics ; no. 56 . Includes bibliographical references and index ISBN: PND 3.90 Subjects--Topical Terms: Cluster set theorySet theory Dewey Class. No.: 513.83