International Ferro-alloys Conference 3rd.Athens 1981 International Ferro-Alloys Conference. International Cadmium Conference(3rd:1981) International Clay Conference 1981 International Electrical,Electronics Conference and Exposition,1981 International coal conference 1963 Oct. International Flavor Conference,2d,Athens,Greece,1981 International conference on Lasers'85 Internationl Microelectronics Conferencd 1981 International Aluminun Welding Conference,Cleveland,1981