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Niederkorn M. ARS DICTAMINIS - RHETORICA BONA ET UTILIS. THEORY OF LETTERS, EXAMPLES OF SAMPLE LETTERS AND COLLECTIONS OF LETTERS. . gerundium [Internet]. 2021 Jun. 29 [cited 2021 Oct. 25];12(1-2):31-73. Available from: https://ojs.lib.unideb.hu/gerundium/article/view/9638