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  1. Modelling of the First-Order Time-Varying Filters with Periodically Variable Coefficients

    Article • Mathematical Problems in Engineering, January 2017, Hindawi Publishing Corporation

    Dariusz Grabowski, Anna Piwowar

  2. Models of n-th order linear time – varying systems

    Article • Archives of Electrical Engineering, January 2015, De Gruyter

    Anna Piwowar

  3. Time-frequency responses of generalized first order parametric sections*

    Article • Archives of Electrical Engineering, January 2015, De Gruyter

    Anna Piwowar