@article{A. Appel1994,
author = "A. Appel and Gerhard W{\"o}rner and G. Alvarado and C. Rundle and S. Kussmaul",
journal = "Profil",
pages = "63-70",
title = "{A}ge relations in volcanic rocks from {C}osta {R}ica: {A} summary",
volume = "7",
year = "1994",
}