00867cam a2200229 a 45000010008000000030008000080050017000160080041000330400021000740500015000950820015001101000055001252450100001802600035002803000034003154900059003495000044004085000068004525000030005206500025005508300062005752252351BD-DhUL20140902091024.0870401s1964    enk           00000 eng d  cBD-DhULdBD-DhUL0 aQA621bB650 a516.7bBOE1 aBoltianskii, V. G.q(Vladimir Grigorevich),d1925-10aEnvelopes /cby V. G. Boltyanskii ; Translated and adapted from the Russian by Robert B. Brown.  aOxford :bPergamon Pr.,c1964.  aix, 76 p. :billus. ;c23 cm.0 aSurvey of recent East European mathematical literature  aPopular lectures in mathematics, v. 12.  aTranslation of Ogibaiushehaia (transliterated: Ogibaiushchaia).  a"A Pergamon Press book.". 0aEnvelopes (Geometry) 0aPopular lectures in mathematics (New York, N.Y.) ;vv. 12