1. Poma 2000 s.a. Grenoble,1975
2. Systeme de Transport Urbain;SAVEC,1975
3. Proposal to Ville de Paris Competition for the Establishment of a Mechanical System of Continuous Transport for passenger service in the city of Paris;Lewis,1922
4. Variable-Pitch Screw Accelerators for Synchronous Transportation Systems;Wilson,1972