J. A. Vargas Zamora, J. Acuña-Gonzalez, F. Vásquez, and J. A. Sibaja-Cordero, “Brachiopods, sipunculans, enteropneusts and metals from two estuarine tidal flats, Pacific, Costa Rica”, Rev. Biol. Trop., vol. 64, no. 3, pp. 1311–1331, Sep. 2016.