1. Messungen an Schwingungen von Gdssaulen mit steilen Fronten in Rohrleitungen;Lettau;Deutsche Kratfahrforschung,1939
2. Non-linear oscillations of the column of a gas;Betchov;The Physics of Fluids,1958
3. Periodic shock waves in resonating gas columns;Saenger;Journal of the Acoustical Society of America,1960
4. Non-linear gas oscillation in closed tube;Gorkov;Ingenernij Jurnal,1963
5. Gas oscillation with finite amplitude in closed tube;Guljaev;Ingenernij Jurnal,1963