中国科学技术信息研究所--国家工程技术数字图书馆

university of minnesota.(17)

the ohio state university.(11)

rutgers the state university of new jersey - new brunswick.(10)

university of california davis.(10)

colorado state university.(7)

kansas state university.(7)

north carolina state university.(7)

the university of wisconsin - madison.(7)

oklahoma state university.(6)

university of florida.(6)

cornell university.(5)

michigan state university.(5)

mississippi state university.(5)

university of california berkeley.(5)

university of maryland college park.(5)

washington state university.(5)

wayne state university.(5)

city university of new york.(4)

columbia university.(4)

mcgill university (canada).(4)

north dakota state university.(4)

the university of nebraska - lincoln.(4)

university of illinois at urbana-champaign.(4)

university of oregon.(4)

university of pennsylvania.(4)

clemson university.(3)

iowa state university.(3)

oregon state university.(3)

rutgers the state university of new jersey - new brunswick(3)

state university of new york at stony brook.(3)