中国科学技术信息研究所--国家工程技术数字图书馆

the university of chicago.(8)

the university of wisconsin - madison.(7)

georgetown university.(5)

harvard university.(5)

university of michigan.(5)

columbia university.(4)

duke university.(4)

michigan state university.(4)

university of california berkeley.(4)

city university of new york.(3)

rutgers the state university of new jersey - new brunswick.(3)

the american university.(3)

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

university of california davis.(3)

university of minnesota.(3)

university of pennsylvania(3)

university of pittsburgh.(3)

boston university(2)

dartmouth college.(2)

north carolina state university.(2)

northwestern university.(2)

oklahoma state university.(2)

rutgers the state university of new jersey school of graduate studies.(2)

the university of wisconsin - madison(2)

tulane university.(2)

university of california berkeley(2)

university of california irvine(2)

university of california irvine.(2)

university of california los angeles.(2)

university of colorado at boulder.(2)