1. Multiphase Pumping Technique: Gas-Oil-Water-Sand advertising brochure, Leipzig, Germany.
2. BORNEMANN Multiphase Pumps Simply Ingenious, advertising brochure, Bornemann, Germany.
3. High Pressure Type HP. Pipeline Transfer and Booster Pumps, advertising brochure, Bornemann, Germany.
4. V. M. Ryazantsev, V. A. Vdovenkov, and V. A. Pisarev, “Determination of the forces acting on the screws of a two-screw pump,”Khim. Neft. Mashinostr., No. 3, 15 (1978).