Bachmann, Friedrich, N-gons / Friedrich Bachmann, Eckart Schmidt ; translated by Cyril W. L. Garner. - Toronto ; Buffalo : University of Toronto Press, [1975] - xii, 191 p. : ill. ; - Mathematical exposition 18 . Translation of n-Ecke. ISBN: 0802018432 Universal Decimal Class. No.: 512.568 / BAC