Actas urologicas españolas
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To study the number of authors of papers published in Actas Urologicas Españolas, and to assess the consequences on multiple authorship of the restriction to 6 of the number of authors for paper, established in the instructions for authors since January 1995. ⋯ A great number of authors should modify their habits of co-authorship on papers submitted to Actas Urologicas Españolas, in order to fulfill the new instructions for authors.