Chemical and stable isotope composition of surface and groundwater in the surroundings of the Los Humeros Caldera, Puebla, MexicoThomas Kretzschmar, Matteo Lelli, Ruth Alfaro, Juan Ignacio Sanchez and Yann Rene RamosE3S Web Conf., 98 (2019) 07013DOI: https://doi.org/10.1051/e3sconf/20199807013