550,781 YRJONEN TIMO Prognosis in perthes' disease : a radiographic and clinical study with special reference to predictive radiographic findings : academic dissertation / Timo Yrjonen ; from the Orthopaedic Hospital of the Invalid Foundation. - Helsinki : [University], 1993. - 53, 26 s. wiele liczb. : il. ;25 cm Zawiera 5 prac współaut. ISBN 952-90-4404-6