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    La risonanza magnetica

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    L’emangiopericitoma renale. Considerazioni anatomo patologiche e clinico-terapeutiche. Descrizione di un caso.

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    [Renal hemangiopericytoma. Anatomo-pathologic and clinico-therapeutic considerations. A case report]. G Chir. 1999 Jan-Feb;20(1-2):20-4. Fornaro R, Terrizzi A, Secco GB, Canaletti M, Baldi E, Bonfante P, Sticchi C, Baccini P, Cittadini G Jr, Fiorini G, Ferraris R. Cattedra di Semeiotica Chirurgica I, Università degli Studi di Genova. The Authors report a case of renal hemangiopericytoma, whose interest is related to the extreme rarity (24 cases reported until today), its insidious growth, the late in diagnosis, its uncertain clinical-biological evolution, not always predictable. Considering chemotherapy and radiotherapy ineffectiveness, an adequate treatment for such a neoplasm requires the surgical therapy, which must be followed by a careful follow-up

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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