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Two Extensions of the Theorem of newton with respect to the Quadrilateral Circumscribe on the Circle to the Three Dimensional Eucliedian Space by the method of Oka. Memories of Tokyo Metropolitan College of Aeronautical Engineering. 2004. 41. 47-52
IGARASHI Kan, SATO Yoshitaka, SUGIE Michio, TAKATO Setsuo, TOYONARI Toshitaka, MUKOYAMA Kazuo. On the condition for the solid Figure to be Circumscribed to a Sphere. Transactions of Mathematical Education for College and University. 2004. 11. 1. 87-92
On the Extension of Newton's Theorem in the Three Dimensional Euclidian Space. Transactions of Mathematical Education by College and University. 2003. 10. 1. 65-70