中国科学技术信息研究所--国家工程技术数字图书馆

west virginia university.(14)

ecole polytechnique montreal (canada).(13)

colorado school of mines.(9)

university of colorado at boulder.(8)

the pennsylvania state university.(7)

southern illinois university at carbondale.(6)

the ohio state university.(4)

the university of wisconsin - madison.(4)

university of california berkeley.(4)

university of nevada reno.(4)

colorado state university.(3)

ohio university.(3)

the university of arizona.(3)

the university of western ontario (canada).(3)

university of colorado at denver.(3)

university of johannesburg (south africa)(3)

university of windsor (canada).(3)

ecole polytechnique montreal (canada)(2)

indiana state university.(2)

the university of alabama.(2)

the university of oklahoma.(2)

the university of western ontario (canada)(2)

universite de sherbrooke (canada).(2)

university of idaho.(2)

university of massachusetts amherst(2)

university of massachusetts amherst.(2)

university of toronto (canada).(2)

university of windsor (canada)(2)

virginia polytechnic institute and state university(2)

virginia polytechnic institute and state university.(2)