中国科学技术信息研究所--国家工程技术数字图书馆

indiana university.(7)

university of california los angeles.(7)

harvard university.(5)

the university of north carolina at chapel hill.(5)

university of michigan.(5)

city university of new york.(4)

duke university.(4)

georgetown university.(4)

new york university.(4)

the university of chicago.(4)

university of massachusetts amherst.(4)

university of toronto (canada).(4)

arizona state university.(3)

colorado state university.(3)

northwestern university.(3)

the ohio state university.(3)

the university of north carolina at charlotte.(3)

university of illinois at urbana-champaign.(3)

university of minnesota.(3)

university of southern california.(3)

american university.(2)

boston university.(2)

columbia university.(2)

cornell university.(2)

kansas state university.(2)

northeastern university.(2)

northern arizona university.(2)

princeton university.(2)

rice university.(2)

rutgers the state university of new jersey - new brunswick.(2)