Khadziivanov, Nikolay. “ON THE MAXIMAL NUMBER OF TRIANGLES WITH A COMMON EDGE”. Ann. Sofia Univ. Fac. Math. and Inf. 82, no. 1 (December 12, 1991): 37–49. Accessed November 22, 2024. https://annual.uni-sofia.bg/index.php/fmi/article/view/521.