中国科学技术信息研究所--国家工程技术数字图书馆

harvard university.(34)

university of minnesota.(34)

university of california los angeles.(26)

iowa state university.(21)

university of michigan.(20)

michigan state university.(17)

the university of wisconsin - madison.(15)

boston university.(12)

north carolina state university.(12)

the johns hopkins university.(12)

princeton university.(11)

the university of north carolina at chapel hill.(11)

university of california san diego.(11)

wayne state university.(11)

colorado state university.(10)

kansas state university.(10)

emory university.(9)

university of arkansas.(9)

university of colorado at boulder.(9)

walden university.(9)

the ohio state university.(8)

university of california davis.(8)

university of illinois at chicago.(8)

university of illinois at urbana-champaign.(8)

university of toronto (canada).(8)

university of washington.(8)

washington university in st. louis.(8)

indiana university.(7)

northeastern university.(7)

rutgers the state university of new jersey - new brunswick.(7)