S. YAKOVYN and S. MELNYCHUK, “APPROXIMATION OF INDICATOR FUNCTIONS IN THE CONTEXT OF PROBABILISTICDISCRETE PERCEPTRON”, Herald of Khmelnytskyi National University. Technical sciences, vol. 353, no. 3.2, pp. 357–364, Jun. 2025, doi: 10.31891//2307-5732-2025-353-50.