1. R. N. Porter and H. B. Stanford, Propellant Expulsion in Unmanned Spacecraft, JPL Technical Report No. 32-899,July 1966.
2. 0.F. Kellerand L. R. Toth, ALPS GenerantTank Cell Assembly, JPL Report 32-865, February28,1966.
3. Coulbert, Cuddihy and Fedors, Contract NAS7-100.
4. AlAA Paper 93-0690