1. Proprioceptive neuromuscular facilitation: patterns and techniques;Knott,1968
2. The proprioceptors and their associated reflexes;O’Connell,1972
3. A comparison of static stretching and PNF stretching for improving hip joint flexibility;Prentice;Ath Tr,1983
4. Comparison of hold-relax procedure and passive mobilization on increasing muscle length;Tanigawa;Phys Ther,1972
5. Flexibility training: ballistic, static or proprioceptive neuromuscular facilitation?;Sady;Arch Med Rehab,1982