MathSciNet bibliographic data MR716789 (85b:11098) 11R29 (11D09 11R18) Yokoi, Hideo On the Diophantine equation $x\sp{2}-py\sp{2}=\pm 4q$$x\sp{2}-py\sp{2}=\pm 4q$ and the class number of real subfields of a cyclotomic field. Nagoya Math. J. 91 (1983), 151–161. Article

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