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.(31)

columbia university.(27)

harvard university.(27)

university of california berkeley.(24)

the university of north carolina at chapel hill.(20)

princeton university.(19)

the pennsylvania state university.(17)

university of pennsylvania.(17)

the claremont graduate university.(16)

boston university.(14)

city university of new york.(14)

duke university.(14)

georgetown university.(14)

new york university.(14)

the university of wisconsin - madison.(14)

university of california los angeles.(13)

york university (canada).(13)

george mason university.(12)

indiana university.(12)

michigan state university.(12)

purdue university.(12)

temple university.(12)

the johns hopkins university.(12)

university of michigan.(12)

boston college.(11)

rutgers the state university of new jersey - new brunswick.(11)

stanford university.(11)

the chinese university of hong kong (hong kong).(11)

university of maryland college park.(11)