Ferretti, M., Bussotti, F., Calatayud, V., Schaub, M., Krauchi, N., Petriccione, B., Sanchez Pena, G., Sanz, M.J., Ulrich, E. 2007. Ozone and forests in South-Western Europe – What have we learned?. ENVIRON POLLUT, 145:652-655.
Ferretti, M., Bussotti, F., Calatayud, V., Schaub, M., Krauchi, N., Petriccione, B., Sanchez Pena, G., Sanz, M.J., Ulrich, E. 2007. Ozone and forests in South-Western Europe – What have we learned?. ENVIRON POLLUT, 145:652-655.