1. Vibration of a string with time-varying length;Kotera;Memoirs of the Faculty of Engineering, Kobe University,1978
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3. Schwingungen von bewegten Saiten verranderlicher Lange;Waur;Zeitschrift für Angewandte Mathematik und Mechanik,1975
4. The vibration of shaft ropes with time-variable length, treated by means of Riemann's method;Schaffers;Transactions of the American Society of Mechanical Engineers, Series B,1961
5. Instability of the motion of a beam of periodically varying length;Zajaczkowski;Journal of Sound and Vibration,1979