中国科学技术信息研究所--国家工程技术数字图书馆

university of michigan.(54)

university of toronto (canada).(54)

boston university.(46)

the chinese university of hong kong (hong kong).(31)

state university of new york at stony brook.(26)

university of california los angeles.(26)

university of minnesota.(24)

purdue university.(23)

the university of alabama at birmingham.(23)

university of california berkeley.(22)

state university of new york at buffalo.(21)

colorado state university.(20)

stanford university.(20)

the university of arizona.(20)

the university of wisconsin - madison.(20)

university of pennsylvania.(20)

the university of iowa.(19)

university of california davis.(19)

harvard university.(18)

rensselaer polytechnic institute.(18)

university of notre dame.(18)

tufts university.(17)

drexel university.(16)

rutgers the state university of new jersey - new brunswick.(15)

university of colorado at boulder.(15)

university of rochester.(15)

columbia university.(14)

cornell university.(14)

iowa state university.(14)

university of california san francisco.(14)