中国科学技术信息研究所--国家工程技术数字图书馆

university of michigan.(71)

university of toronto (canada).(44)

university of minnesota.(39)

university of california los angeles.(38)

university of illinois at urbana-champaign.(36)

michigan state university.(35)

arizona state university.(34)

state university of new york at buffalo.(34)

university of california berkeley.(32)

the university of wisconsin - madison.(30)

iowa state university.(28)

north carolina state university.(26)

the pennsylvania state university.(26)

university of delaware.(26)

boston university.(25)

university of california irvine.(25)

university of california davis.(24)

university of washington.(24)

walden university.(24)

purdue university.(23)

the university of texas at dallas.(22)

georgia institute of technology.(21)

harvard university.(21)

university of kansas.(21)

capella university.(19)

kansas state university.(19)

missouri university of science and technology.(19)

northwestern university.(19)

texas a&m university.(19)

the university of north carolina at chapel hill.(19)