Popov A, Michovski M. Assymptotic solutions in the ultrasonic corrosion control. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 1996 Dec. 12 [cited 2024 Nov. 21];88:341-6. Available from: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/393