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. 2004. 11. 1. 87-92
Two Extensions of the Theorem of Newton with respect to the Quadrilateral Circumscribe on the Circle to the Three Dimensional Eucliedian Space. Memoirs 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 Kosen Bunkai of Japan Society of Mathematical Education. 2004. 11. 1. 87-92
On the Extension of Newton's Theorem in the Three Dimensional Euclidean Space. Transactions of Mathematical Education for Kosen and University. 2003. 10. 1. 65-70