Ivanov Геннадий Григорьевич, Alferov Геннадий Викторович, and Korolev Владимир Степанович. 2021. “Derivative Number Apparatus and Application Possibilities”. BULLETIN OF PERM UNIVERSITY. MATHEMATICS. MECHANICS. COMPUTER SCIENCE, no. 3 (54) (October). https://doi.org/10.17072/1993-0550-2021-3-5-18.