Romanowska, A. B. Modal theory: an algebraic approach to order, geometry, and convexity/ A. B. Romanowska, J. D. H. Smith. - Berlin: Heldermann, c1985. - xii, 158 p.: ill.; 24 cm. - Research and exposition in mathematics; 9. . Includes indexes. Bibliography: p. 150-153. ISBN: 3885382091 (pbk.) : DM38.00 LCCN: 85201791 Subjects--Topical Terms: Geometry, Algebraic.Moduli theory. Dewey Class. No.: 516.35 / R759m