A. Protonotariou, M. Tombrou, C. Giannakopoulos, E.Kostopoulou, P.LeSager: Study of CO surface pollution in Europe based on observations and nested-grid applications of GEOS-CHEM global chemical transport model, Tellus Series B – Chemical and Physical Meteorology Vol 62 p.209-227 Doi: 10.1111/j.1600-0889.2010.00462.x, 2010