1. Zihni Burçay Sarıbay. Analytical investigation of the pericyclic variable-speed transmission system for helicopter main-gearbox. The Pennsylvania State University, Pennsylvania, (2009).
2. George K. Fischer. Advanced power transmission technology. NASA CP-2210, (1983).
3. Gilbert J. Weden, John J. Coy. Summary of drive-train component technology in helicopters. NASA TM-83726, (1984).
4. Yin Zeyong, Fu Bibo, Xue Tongbo, et al. Development of helicopter power transmission system technology. Applied Mechanics and Materials, Vol. 86 (2011), pp.1-17.
5. Andrew T. Bellocchio. Drive system design methodology for a single main rotor heavy lift helicopter. Georgia Institute of Technology, Georgia, (2005).