中国科学技术信息研究所--国家工程技术数字图书馆

university of north texas.(9)

rice university.(6)

the university of wisconsin - madison.(6)

university of georgia.(6)

city university of new york.(5)

the university of iowa.(5)

the university of nebraska - lincoln.(5)

university of maryland college park.(5)

university of south carolina.(5)

west virginia university.(5)

the university of north carolina at chapel hill.(4)

university of california san diego.(4)

stanford university.(3)

the university of arizona.(3)

the university of texas at san antonio.(3)

tufts university.(3)

university of cincinnati.(3)

university of michigan.(3)

university of oregon.(3)

arizona state university.(2)

california state university los angeles.(2)

columbia university.(2)

harvard university.(2)

mcgill university (canada).(2)

northwestern university.(2)

technische universitaet berlin (germany).(2)

temple university.(2)

the university of north carolina at greensboro.(2)

university of california berkeley.(2)

university of california irvine.(2)