中国科学技术信息研究所--国家工程技术数字图书馆

new york university.(7)

the university of wisconsin - madison.(5)

university of california los angeles.(5)

columbia university.(4)

the chinese university of hong kong (hong kong).(4)

the university of chicago.(4)

university of california san diego.(4)

university of pennsylvania.(4)

arizona state university.(3)

harvard university.(3)

michigan state university.(3)

the george washington university.(3)

university of delaware.(3)

university of minnesota.(3)

university of washington.(3)

walden university.(3)

american university.(2)

cornell university.(2)

hong kong university of science and technology (hong kong).(2)

north carolina state university.(2)

princeton university.(2)

purdue university.(2)

state university of new york at albany.(2)

syracuse university.(2)

the johns hopkins university.(2)

the university of arizona.(2)

the university of nebraska - lincoln.(2)

university of california berkeley(2)

university of california davis.(2)

university of california irvine.(2)