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Çetin Ülgen, Temel Özdemir, Remzi Sağlam
(Urol Res Pract 1977; 3: 397-399)
Yavuz Önol, Çetin Ülgen, Agah Hacıislamoğlu
(Urol Res Pract 1982; 8: 119-126)