M. ARUNKUMAR; M. J. RASSIAS; S. HEMA LATHA; YANHUI ZHANG. Ulam Stabilities of $K$ - AC - Mixed Type Functional Equations in Three Variables. International Journal of Mathematics And its Applications, [S. l.], v. 3, n. 4 - C, p. 49–78, 2015. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/507. Acesso em: 13 may. 2024.