(4) S. De Donno: The S. B. S. PROJECTDEVELOPMENT OF A SUBSEA BOOSTER SYSTEM FOR THE EXPLOITATION OF DEEP WATER OIL FIELDS, 5'th DOT Int. Conf., Proc. V1, B2, p.49-69,(1989).
(5) P.J. Dolan.: Development of a Twin-Screw Pump for Multi-phase Duties, SPE 15881 (1986).