Georgieva, B. (2011) “SYMMETRIES OF THE HERGLOTZ VARIATIONAL PRINCIPLE IN THE CASE OF ONE INDEPENDENT VARIABLE”, Ann. Sofia Univ. Fac. Math. and Inf, 100, pp. 113–122. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/249 (Accessed: 22 November 2024).