Formation of Characteristic Polynomials on the Basis of Fractional Powers j of Dynamic Systems and Stability Problems of Such Systems oleh Orest Lozynskyy, Damian Mazur, Yaroslav Marushchak, Bogdan Kwiatkowski, Andriy Lozynskyy, Tadeusz Kwater, Bohdan Kopchak, Przemysław Hawro, Lidiia Kasha, Robert Pękala, Robert Ziemba, Bogusław Twaróg