中国科学技术信息研究所--国家工程技术数字图书馆

university of california los angeles.(110)

arizona state university.(101)

indiana university.(101)

university of toronto (canada).(100)

the university of wisconsin - madison.(98)

university of washington.(93)

harvard university.(87)

the university of north carolina at chapel hill.(83)

university of california berkeley.(83)

michigan state university.(79)

the university of arizona.(78)

university of michigan.(78)

university of minnesota.(73)

columbia university.(72)

city university of new york.(70)

university of colorado at boulder.(67)

new york university.(62)

university of kansas.(62)

state university of new york at buffalo.(60)

university of illinois at urbana-champaign.(60)

the university of chicago.(57)

university of california santa barbara.(56)

university of maryland college park.(56)

rutgers the state university of new jersey - new brunswick.(55)

the pennsylvania state university.(55)

university of pennsylvania.(54)

purdue university.(53)

the florida state university.(52)

indiana university of pennsylvania.(51)

alliant international university.(50)