1.
Study of the scientific work by quantitative methods: some results on Academician Nikola Obreshkoff’s works. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 1997 Dec. 12 [cited 2026 Jan. 11];89:117-2. Available from: https://annual.uni-sofia.bg/index.php/fmi/article/view/361