中国科学技术信息研究所--国家工程技术数字图书馆

university of pennsylvania.(7)

university of washington.(7)

city university of new york.(6)

university of california san diego.(6)

oklahoma state university.(5)

university of minnesota.(5)

clemson university.(4)

michigan state university.(4)

mississippi state university.(4)

teachers college columbia university.(4)

the university of arizona.(4)

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

the university of wisconsin - madison.(4)

university of california berkeley.(4)

university of california los angeles.(4)

university of california san diego(4)

university of florida.(4)

university of ottawa (canada).(4)

utah state university.(4)

capella university(3)

harvard university.(3)

northwestern university.(3)

pontificia universidad catolica de chile (chile).(3)

the claremont graduate university.(3)

the ohio state university.(3)

the university of chicago.(3)

the university of iowa.(3)

the university of north dakota.(3)

tufts university.(3)

university of california riverside.(3)