6Barry B, Corley E. Scientists' collaboration strategies : Implications for scientific and technical human capital. Research Policy, 2004, 33(4) :599 -616.
7Katz J S, Martin B R. What is research collaboration?. Research Policy, 1997,26 ( 1 ) : 1 - 18.
8Smith M. The trend toward multiple authorship in psychology. American Psychologist, 1958,13 ( 10 ) : 596 - 599.
9Beaver D. Feature report: Reflections on scientific collaboration (and its study) : Past, present, and future. Seientometrics, 2001, 52(3) : 365 -377.
10Price D. Little science, big science. New York: Columbia University Press, 1963.