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 north carolina at chapel hill.(6)

university of toronto (canada).(6)

the chinese university of hong kong (hong kong).(5)

universite de montreal (canada).(5)

university of california berkeley.(5)

university of pennsylvania.(5)

arizona state university.(4)

georgetown university.(4)

state university of new york at albany.(4)

the university of chicago.(4)

university of michigan.(4)

columbia university.(3)

cornell university.(3)

florida atlantic university.(3)

george mason university.(3)

mcgill university (canada).(3)

stanford university.(3)

the university of arizona.(3)

the university of north carolina at chapel hill(3)

the university of wisconsin - madison.(3)

university of california irvine.(3)

university of nevada las vegas.(3)

university of toronto (canada)(3)

university of washington.(3)

boston university.(2)

capella university.(2)

emory university(2)

harvard university.(2)

iowa state university.(2)

michigan state university(2)