中国科学技术信息研究所--国家工程技术数字图书馆

the university of north carolina at chapel hill.(15)

columbia university.(14)

university of california berkeley.(13)

university of california los angeles.(13)

georgetown university.(10)

university of illinois at urbana-champaign.(10)

university of washington.(10)

harvard university.(9)

indiana university.(9)

university of toronto (canada).(9)

duke university.(8)

old dominion university.(8)

the university of chicago.(8)

the university of wisconsin - madison.(8)

university of california davis.(8)

university of michigan.(8)

university of minnesota.(8)

the university of north carolina at chapel hill(7)

university of south carolina.(7)

rutgers the state university of new jersey - new brunswick.(6)

state university of new york at buffalo.(6)

university of maryland college park.(6)

university of pennsylvania.(6)

university of southern california.(6)

yale university.(6)

city university of new york.(5)

north carolina state university.(5)

princeton university.(5)

universite de montreal (canada).(5)

university of california irvine.(5)