中国科学技术信息研究所--国家工程技术数字图书馆

university of toronto (canada).(32)

the university of chicago.(24)

columbia university.(21)

harvard university.(19)

georgetown university.(14)

university of illinois at urbana-champaign.(12)

princeton university.(11)

the catholic university of america.(11)

the claremont graduate university.(10)

the university of north carolina at chapel hill.(10)

the university of wisconsin - madison.(10)

emory university.(9)

southern illinois university at carbondale.(9)

university of california los angeles.(9)

university of washington.(9)

boston college.(8)

northwestern university.(8)

temple university.(8)

university of california riverside.(8)

university of kansas.(8)

duke university.(7)

rutgers the state university of new jersey - new brunswick.(7)

the pennsylvania state university.(7)

university of california berkeley(7)

university of california berkeley.(7)

university of california irvine.(7)

yale university.(7)

boston university.(6)

duquesne university.(6)

mcgill university (canada).(6)