Maltsev, Yu.N., and E.P. Petrov. “On Some Properties of a Quadrilateral Whose Vertices Are Remarkable Points of the Triangle”. Izvestiya of Altai State University0, no. 4(126) (September 9, 2022): 123-127. Accessed July 22, 2024. http://izvestiya.asu.ru/article/view/%282022%294-19.