Envelopes
Boltyanskii, V. G.
Envelopes V. G. Boltyanskii - Oxford Pergamon Press 1964 - ix,76p. 22cm. - Popular Lectures in Mathematics; v.12 .
Envelopes (Geometry)
MATH QA621.B65
Envelopes V. G. Boltyanskii - Oxford Pergamon Press 1964 - ix,76p. 22cm. - Popular Lectures in Mathematics; v.12 .
Envelopes (Geometry)
MATH QA621.B65