BIFURCATION ANALYSIS OF THE DYNAMICAL SYSTEM FOR A THREELAYERED VALVE WITH PERPENDICULAR ANISOTROPYNatalia Ostrovskaya, Vladimir Skidanov, Iulia Iusipova and Maxims SkvortsovEPJ Web Conf., 185 (2018) 01008DOI: https://doi.org/10.1051/epjconf/201818501008