. . "S Hammerby" . . . "The natural history of Perthes' disease"@en . . . "The natural history of Perthes' disease"@en . . . "1" . "The natural history of Perthes' disease"@en . "art\u00EDculu cient\u00EDficu espubliz\u00E1u en xineru de 1991"@ast . . "\u043D\u0430\u0443\u043A\u043E\u0432\u0430 \u0441\u0442\u0430\u0442\u0442\u044F, \u043E\u043F\u0443\u0431\u043B\u0456\u043A\u043E\u0432\u0430\u043D\u0430 \u0432 \u0441\u0456\u0447\u043D\u0456 1991"@uk . "The natural history of Perthes' disease"@nl . "artikull shkencor i botuar m\u00EB 01 janar 1991"@sq . . "The natural history of Perthes' disease"@nl . . . "13-16" . . . . . . . . "15" . . . "The natural history of Perthes' disease"@en . . . . . "2071274" . "H Tkaczuk" . . . "10.1007/BF00210525" . . "1991-01-01T00:00:00Z"^^ . "The natural history of Perthes' disease"@nl . . . . "scientific article published on 01 January 1991"@en . . . . . "wetenschappelijk artikel"@nl . "im Jahr 1991 ver\u00F6ffentlichter wissenschaftlicher Artikel"@de . "article scientifique publi\u00E9 en 1991"@fr . . . . . . . "R Norlin" .