TY - JOUR AU - Frizziero, L; Govoni, E; Bacchini, P TI - Intra-articular hyaluronic acid in the treatment of osteoarthritis of the knee: clinical and morphological study JO - Clin Exp Rheumatol IS - 04 VL - 16 PY - 1998 SP - 441 EP - 449 ER -