Sobchuk VV, Zelenska IO. Construction of asymptotics of the solution for a system of singularly perturbed equations by the method of essentially singular functions. BTSNUKPhM [Internet]. 2023 Dec. 23 [cited 2025 Jan. 19];(2):184-92. Available from: https://bphm.knu.ua/index.php/bphm/article/view/414