Arakelian, A. Z., and E. A. Danielyan. “ABOUT THE MAXIMUM SUM OF CASUAL NUMBER OF INDEPENDANT CASUAL QUANTITY”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 34, no. 2 (193), Oct. 2000, pp. 24-35, https://doi.org/10.46991/PYSUA.2000.34.2.024.