1. D. V. Babich, "Discrete approximation method of the functional in determining the stability of shells of revolution," Prikl. Mekh.,19, No. 2, 38?44 (1983).
2. G. V. Brandt, "Multifocal surfaces in nature and in the construction industry," Bion., No. 5, 112?117 (1981).
3. G. V. Brandt, "Mathematical model of a natural shell of eggshell type," Bion., No. 17, 84?89 (1983).
4. E. I. Grigolyuk, "Plastic buckling of shells of revolution," Izv. Akad. Nauk SSSR, Otd. Tekh. Nauk, No. 2, 130?132 (1958).
5. Yu. N. Rabotnov, "Local stability of shells," Dokl. Akad. Nauk,52, No. 2, 111?112 (1946).