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This article is substantially duplicated by a piece in an external publication. Please do not flag this article as a copyright violation of the following source:
S. N. Krivoshapko & V. N. Ivanov (2015), Encyclopedia of Analytical Surfaces
Additional comments
Section 1.1.3, Conical surfaces, pp. 59–60 contains wording copied from our article (from versions existing well before the publication date of this source). Therefore, unfortunately, it cannot be used as a reference.