Ivanova-Karatopraklieva, I. (1993) “Infinitesimal bendings with sliding of higher order of rotational surfaces”, Ann. Sofia Univ. Fac. Math. and Inf, 84, pp. 69–82. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/470 (Accessed: 22 November 2024).