Chobanov, Georgi, and Ivan Chobanov. 1994. “Newtonian and Eulerian Dynamical Axioms. VI. Inductio Per Enumerationem Simplicem”. Ann. Sofia Univ. Fac. Math. And Inf. 86 (2):99-122. https://annual.uni-sofia.bg/index.php/fmi/article/view/508.