International Journal of Greenhouse Gas Control International Journal of Greenhouse Gas Control High-pressure speed of sound in pure CO2 and in CO2 with SO2 as an impurity using methanol as a doping agent Rivas C. Gimeno B. Universidad de Zaragoza Artal M. Universidad de Zaragoza Blanco S. T. Universidad de Zaragoza Fernández J. Universidad de Zaragoza Velasco I. Universidad de Zaragoza 2016 research-article