3 citations to https://www.mathnet.ru/rus/mmj298

1. Skopenkov M., Krasauskas R., “Surfaces Containing Two Circles Through Each Point”, Math. Ann., 373:3-4 (2019), 1299–1327          
2. Fedor Nilov, Mikhail Skopenkov, “A surface containing a line and a circle through each point is a quadric”, Geom Dedicata, 163:1 (2013), 301  
3. Pottmann H., Shi L., Skopenkov M., “Darboux cyclides and webs from circles”, Comput Aided Geom Design, 29:1 (2012), 77–97