$a Kp. Przewodnik po pakiecie R / Przemysław Biecek. - Wrocław, 2008.
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$a OPI online
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$a Baza Wiedzy PW, 28.06.2021 $u https://repo.pw.edu.pl/info/author/WUT6f30cba9ae954efb9e069696681ff48a/Profil%2Bosoby%2B%25E2%2580%2593%2BPrzemys%25C5%2582aw%2BBiecek%2B%25E2%2580%2593%2BPolitechnika%2BWarszawska?affil=&tab=main&conversationPropagation=begin&sort=&lang=pl&pn=1