2 citations to https://www.mathnet.ru/rus/rm1740

1. Malyutina A.N., Mikhaylov M.D., “The Knight of Science Viktor Andreevich Toponogov”, Vestn. Tomsk. Gos. Univ.-Mat. Mek., 2020, no. 65, 148–156      
2. Pambuccian V., Zamfirescu T., “Paolo Pizzetti: The forgotten originator of triangle comparison geometry”, Historia Mathematica, 38:3 (2011), 415–422