TY - BOOK AU - Pogorelov,A.V. AU - Kra,Irwin AU - Zaustinskiy,Eugene TI - Hilbert's fourth problem U1 - 516 PY - 1979/// CY - Washington, New York PB - V. H. Winston, distributed solely by Halsted Press KW - Geometry KW - Foundations N1 - Translation of Chetvertaia problema Gilberta; Includes index ER -