Khaled  Zennir, Salah  Boulaaras, Bahri  Cherif, Ali  Allahem, 
    New Mathematical Studies for Surface Waves on Multi-Layered Liquid Films,
    Research Journal of Applied Sciences,
    Volume 14,Issue 2,
    2019,
    Pages 61-66,
    ISSN 1815-932x,
    rjasci.2019.61.66,
    (https://makhillpublications.co/view-article.php?doi=rjasci.2019.61.66)
    Abstract: We consider a coupled system of mathematical problem given in the form of two partial differential
equations in viscoelasticities describing the propagation of surface waves on multi-layered liquid films. We
establish the existence of solutions for initial-value problem (1.3) in the linear case by using a priori energy
estimates.
    Keywords: Surface waves;existence;multi-layered liquid film;infinite memory;mathematical problem;viscoelasticities