Concordance of undifferentiated and differentiated RPE estimation and RPE production responses in male distance runners (concordance des estimations non-differenciees et differentiees de la perception de l'effort et reponses a la production de RPE chez des coureurs de fond hommes) - MERCER, TH; WYSE, JP; MILLS, J; GLEESON, NP (Journal of Sports Sciences, 1994)