Solovev, Anton S., and Anatoly O. Bochkarev. “Buckling of an Annular Plate under Tensile Point Loading”. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, vol. 4, no. 1, Aug. 2020, pp. 136-45, https://math-mech-astr-journal.spbu.ru/article/view/8583.