Courant, Richard, 1888-1972. Dirichlet's principle, conformal mapping, and minimal surfaces / With an appendix by M. Schiffer. - New York : Interscience Publishers, 1967. - xiii, 330 p. : diagrs. - Pure and applied mathematics: a series of texts and monographs 3 . Bibliography: p. 245-248, 319-323. Subjects--Topical Terms: Surfaces, Representation of.