Ninova, Julia, and Vesselka Mihova. “COMPOSITION OF INVERSE PROBLEMS WITH A GIVEN LOGICAL STURCTURE”. Ann. Sofia Univ. Fac. Math. and Inf. 101 (December 12, 2013): 167–181. Accessed November 24, 2024. https://ftl5.uni-sofia.bg./index.php/fmi/article/view/237.