'A Halsted Press book'.
Translation of: 'Chetvertaia problema Gil'berta'. Moskva : Nauka, 1974.
Bibliography: p.93-94. _ Includes index.
Hilbert's fourth problem by Alekseĭ Vasil'evich Pogorelov. ISBN 0470267356. Published by V.H. Winston and Sons in 1979. Publication and catalogue information, links to buy online and reader comments.