BIFURCATION ANALYSIS OF THE DYNAMICAL SYSTEM FOR A THREELAYERED VALVE WITH PERPENDICULAR ANISOTROPY Natalia Ostrovskaya, Vladimir Skidanov, Iulia Iusipova and Maxims Skvortsov EPJ Web Conf., 185 (2018) 01008 Published online: 04 July 2018 DOI: 10.1051/epjconf/201818501008