中国科学技术信息研究所--国家工程技术数字图书馆

arizona state university.(6)

harvard university.(6)

university of california berkeley.(6)

stanford university.(5)

tennessee state university.(5)

university of maryland college park.(5)

capella university.(4)

columbia university.(4)

george mason university.(4)

pontificia universidad catolica del peru - centrum catolica (peru).(4)

rutgers the state university of new jersey - new brunswick.(4)

the florida state university.(4)

the george washington university.(4)

university of cincinnati.(4)

university of michigan.(4)

university of southern california.(4)

university of washington.(4)

cornell university.(3)

georgia institute of technology.(3)

michigan state university.(3)

northern illinois university.(3)

state university of new york at binghamton.(3)

texas a&m university(3)

the ohio state university.(3)

the university of north carolina at greensboro.(3)

the university of texas at austin.(3)

the university of texas at dallas.(3)

tufts university.(3)

university of california davis.(3)

university of california irvine.(3)