中国科学技术信息研究所--国家工程技术数字图书馆

harvard university.(14)

the university of wisconsin - madison.(8)

university of california los angeles.(7)

university of michigan.(7)

university of pennsylvania.(7)

university of toronto (canada).(7)

northwestern university.(6)

the ohio state university.(6)

the university of chicago.(6)

university of california berkeley.(6)

duke university.(5)

new york university.(5)

the university of texas at austin.(5)

city university of new york.(4)

columbia university.(4)

stanford university.(4)

state university of new york at buffalo.(4)

the florida state university.(4)

the johns hopkins university.(4)

university of illinois at urbana-champaign.(4)

university of minnesota.(4)

university of virginia.(4)

arizona state university.(3)

indiana university.(3)

liverpool john moores university (united kingdom).(3)

mcgill university (canada).(3)

michigan state university.(3)

princeton university(3)

princeton university.(3)

the university of north carolina at chapel hill.(3)