1. Unstable Operation of High-Head Reversible Pump-Turbines;Pejovic
2. Stability of Pump-Turbines During Transient Operation;Martin
3. Instability of Pump-Turbines with S-Shaped Characteristics;Martin
4. Starting Pump-Turbines with Unstable Characteristics;Staubli
5. Unstable Pump-Turbine Characteristics and their Interaction with Hydraulic Systems;Widmer