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The young open cluster Berkeley 55 Negueruela Díez, Ignacio - Marco Tobarra, Amparo
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Higher accurate approximate solutions for the simple pendulum in terms of elementary functions Beléndez Vázquez, Augusto - Francés Monllor, Jorge - Ortuño Sánchez, Manuel - Gallego Rico, Sergi - Bernabeu Pastor, José Guillermo
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