Published European procedures to river quality assessment by Naddeo V., Zarra T. and Belgiorno V. paper_11_NADDEO_383.pdf
Published Analysis of the 11-year Record (1987-1997) of Air Pollution measurements in Athens, Greece. Part II: Photochemical air pollutants by Kalabokas P.D., Viras L.G., Repapis C.C. kalabokas_partII.pdf