ZOHN, D A A COMPARISON OF ISOMETRIC AND ISOTONIC EXERCISES OF THE QUADRICEPS AFTER INJURIES TO THE KNEE. [electronic resource] - Archives of physical medicine and rehabilitation Nov 1964 - 571-4 p. digital Publication Type: Journal Article ISSN: 0003-9993 Subjects--Topical Terms: AdolescentBiomedical ResearchExercise TherapyHumansKnee InjuriesQuadriceps MuscleRehabilitation