中国科学技术信息研究所--国家工程技术数字图书馆

iowa state university.(5)

case western reserve university.(4)

the university of texas at arlington.(4)

northwestern university.(3)

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

south dakota state university.(3)

the university of arizona.(3)

the university of wisconsin - madison.(3)

university of california berkeley.(3)

university of toronto (canada).(3)

university of washington.(3)

michigan state university.(2)

middle tennessee state university.(2)

state university of new york at binghamton.(2)

tennessee technological university.(2)

the florida state university.(2)

the pennsylvania state university.(2)

the university of alabama at birmingham.(2)

university of california los angeles.(2)

university of illinois at urbana-champaign.(2)

university of minnesota.(2)

university of notre dame.(2)

university of petra (jordan).(2)

university of windsor (canada).(2)

washington state university.(2)

auburn university.(1)

brown university.(1)

carnegie mellon university.(1)

chinese university of hong kong (people's republic of china).(1)

clarkson university.(1)