REGARDING SOME FUNDAMENTAL ASPECTS OF DESIGN AND DEVELOPMENT OF BESSEL ULTRASONIC CONCENTRATORS USED IN NONCONVENTIONAL MACHINING. Nonconventional Technologies Review, [S. l.], v. 27, n. 4, 2023. Disponível em: https://revtn.ro/index.php/revtn/article/view/448. Acesso em: 22 apr. 2026.