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SYMPOSIUM on aquatic toxicology (6th: 1981: St. Louis, Mo.,)
National symposium on fracture mechanics ( 14th: 1981:Los An
Symposium on elastic- plastic fracture mechanics(2nd:1981: Philadelphia)
National symposium on fracture mechanics ( 14th: 1981:Los An
National symposium on fracture mechanics ( 14th: 1981:Los An
An international Symposium (Australia: 1981)
PROCEDINGS of quantum optics and experimental general relativity (1981: Bad Windsheim, Germany)
International Conference on Operational Research (9th : 1981 : Hamburg)
SYMPOSIUM on evalution and accreditation of inspection and test activities (1981:Washington)