Cassels, J. W. S. An introduction to diophantine approximation. - Cambridge, UK: University Press, 1957. - 166 p.: illus.; 22 cm. - Cambridge tracts in mathematics and mathematical physics; no. 45. . Includes bibliography. LCCN: a 57006075 /L/r922 Nat. Bib. No.: GB57-7499 Subjects--Topical Terms: Diophantine approximation.Diophantine approximation. Dewey Class. No.: 512.73 / C344i