Discrete estimators of characteristics for periodically correlated time series. - Ihor Javorskyj; Ivan Matsko; Roman Yuzefovych; Zbigniew Zakrzewski (Digit. Signal Process., 2016)

Statistical analysis of periodically non-stationary oscillations for unknown period. - Ihor Javorskyj; R. M. Roman Yuzefovych; Ivan Matsko; Zbigniew Zakrzewski; Jacek Majewski (MIXDES, 2017)

Coherent covariance analysis of periodically correlated random processes for unknown non-stationarity period. - Ihor Javorskyj; Roman Yuzefovych; Ivan Matsko; Zbigniew Zakrzewski; Jacek Majewski (Digit. Signal Process., 2017)

Hilbert transform of a periodically non-stationary random signal: Low-frequency modulation. - Ihor Javorskyj; Roman Yuzefovych; Ivan Matsko; Pavlo Kurapov (Digit. Signal Process., 2021)

Methods of Hidden Periodicity Discovering for Gearbox Fault Detection. - Ihor Javorskyj; Ivan Matsko; Roman Yuzefovych; Oleh Lychak; Roman Lys (Sensors, 2021)

The least square estimation of the basic frequency for periodically non-stationary random signals. - Ihor Javorskyj; Roman Yuzefovych; Ivan Matsko; Zbigniew Zakrzewski (Digit. Signal Process., 2022)