中国科学技术信息研究所--国家工程技术数字图书馆

university of toronto (canada).(37)

university of alberta (canada).(24)

trent university (canada).(16)

university of manitoba (canada).(15)

carleton university (canada).(14)

university of ottawa (canada).(14)

university of pennsylvania.(14)

dalhousie university (canada).(12)

mcgill university (canada).(12)

york university (canada).(11)

harvard university.(10)

universite du quebec a rimouski (canada).(10)

capella university.(9)

queen's university (canada)(9)

the university of british columbia (canada).(9)

universite laval (canada).(9)

university of california los angeles.(8)

university of guelph (canada).(8)

university of illinois at urbana-champaign.(8)

university of pittsburgh.(8)

michigan state university.(7)

the university of chicago.(7)

the university of north carolina at chapel hill.(7)

new york university.(6)

northcentral university.(6)

rutgers the state university of new jersey - new brunswick.(6)

universite du quebec a chicoutimi (canada).(6)

university of arkansas.(6)

university of calgary (canada).(6)

university of minnesota.(6)