Roberts, R. A. (1884). A collection of examples on the analytic geometry of plane conics: To which are added some examples on spheroconics. Hodges, Figgis.
MLA CitationRoberts, Ralph A.. A Collection of Examples on the Analytic Geometry of Plane Conics: To Which Are Added Some Examples on Spheroconics. Hodges, Figgis, 1884.
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