Cameron DM, Bohannon R. Relationship between active knee extension and active straight leg raise test measurements. J Orthop Sports Phys Ther....
Gajdosik RL, Rieck MA, Sullivan DK, Wightman SE. Comparison of four clinical tests for assessing hamstring muscle length. J Orthop Sports...
Hoehler FK, Tobis JS. Low back pain and its treatment by spinal manipulation: Measures of flexibility and asymmetry. Rheumatol Rehabil. 1982;21(1):21-6.
Fredriksen H, Dagfinrud H, Jacobsen V, Maehlum S. Passive knee extension test to measure hamstring muscle tightness. Scand J Med Sci Sports....
Fisk JW. The passive hamstring stretch test: Clinical evaluation. NZ Med J. 1979;89:209-11.
Bado JL, Barros PC, Ruiggiero A, Navillat M. Analisis estadistico de la frecuencia del sindrome de "retraccion de los isquiotibiales"...