UMEZAWA, Toshio. “Star-Like Theorems and Convex-Like Theorems in an Annulus”. Journal of the Mathematical Society of Japan, vol. 6, no. 1, 1954, https://doi.org/10.2969/jmsj/00610068.
UMEZAWA, T. (1954). Star-like theorems and convex-like theorems in an annulus. Journal of the Mathematical Society of Japan, 6(1). https://doi.org/10.2969/jmsj/00610068
UMEZAWA T. Star-like theorems and convex-like theorems in an annulus. Journal of the Mathematical Society of Japan. 1954;6(1).