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\bibitem{Dattoli_etal2020} {\textquotedblleft}\textit{Parabolic trigonometry}{\textquotedblright}. Dattoli G, Di Palma E, Gielis J, Licciardi S, International journal of applied and computational mathematics \textbf{6}, 37 (2020).   http://doi.org/10.1007/S40819-020-0789-6

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