Stoyanova, Rumyana, and Ivan Tchobanov. “Forces in Newtonian Dynamics and Forces in Eulerian Dynamics”. Ann. Sofia Univ. Fac. Math. and Inf. 88 (December 12, 1996): 441–458. Accessed November 24, 2024. https://annual.uni-sofia.bg/index.php/fmi/article/view/399.