1. Iran Hydraulic Industries Company, Mashhad, Iran, (2002).
2. J. Pippenger and T.G. Hicks. Industrial hydraulics. Mc Graw-Hill, (1980).
3. A. Leroy, J. Mons and B. Flamme. Positive displacement machine having improved displacement curve, Germany and Belgium, patent no. 4, 556, 372.
4. K. Tsuchia, H. Sasaya and A. Nara. Vane pump with cylinder profile defined by cycloid curves, Okazaki, Japan, patent no. 4, 432, 711.
5. I. Hayase, A. Suginuma and A. kishi. Vane type rotary machine, Tokyo, Japan, patent no. 4, 507, 068.