Василенко ЯП, Дмитроца ЛП, Олійник МЗ, Приймак МВ. Ways of functions with variable period definition and their approximation. МІА [Internet]. 2016Jun.24 [cited 2024May6];300:36-7. Available from: https://periodicals.karazin.ua/mia/article/view/6565