C 231.924
The VNR concise encyclopedia of mathematics / W. Gellert ... [et al.], editors ; K.A. Hirsch, H. Reichardt, scientific advisors. -- 1st ed. -- New York : Van Nostrand Reinhold, 1977. -- ISBN : 0-442-22646-2.
Gellert, Walter
matematika * encyklopedie
51. (031)