@article {7755, title = {The Platanar-Aguas Zarcas volcanic centers, Costa Rica: spatial-temporal association of Quaternary calc-alkaline and alkaline volcanism}, volume = {55}, year = {1993}, month = {Aug-01-1993}, pages = {443-453}, issn = {0258-8900, 1432-0819}, doi = {10.1007/bf00302004}, url = {http://dx.doi.org/10.1007/bf00302004}, author = {Alvarado, G E and Carr, M J} }