Observations of aerosol and clouds with the ABLE and MAL lidars during the mid-latitude and arctic ENVISAT validation campaigns, Matthey, R., Cacciani M., Fiocco G., Martinez A.A., Martucci G., Mitev V., Pace Giandomenico, and Stefanutti L. , European Space Agency, (Special Publication) ESA SP, Number 530, Sankt Gallen, p.579-584, (2003)