Vari_1745, A. (1968). THE PHOTOGRAMMETRIC ACTIVITY IN ITALY FROM JANUARY 1st 1964 TO DECEMBER 31st 1967. Bollettino Della Società Italiana Di Fotogrammetria E Topografia, (2), 27–38. Recuperato da https://www.sifet.org/bollettino/index.php/bollettinosifet/article/view/1747