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Razvan Gelca, Titu Andreescu. (2007). Putnam and beyond (978-387-25765-5 (13)). USA: Springer Science Bussiness Media, LLC.

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Razvan Gelca, Titu Andreescu. Putnam and beyond. 978-387-25765-5 (13) USA: Springer Science Bussiness Media, LLC, 2007. Text.

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Razvan Gelca, Titu Andreescu. Putnam and beyond. 978-387-25765-5 (13) USA: Springer Science Bussiness Media, LLC, 2007. Text.

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Razvan Gelca, Titu Andreescu. Putnam and beyond. 978-387-25765-5 (13) USA: Springer Science Bussiness Media, LLC, 2007. Print.