共 101 条
[1]
Abazovic D., 2015, SHORT INTRO PROBLEM
[4]
Adubifa A. O., 2004, ASSESSMENT SCI TECHN
[5]
Akande O., 1996, PAPER PRESENTED COUR
[7]
Public goods and ethnic divisions
[J].
QUARTERLY JOURNAL OF ECONOMICS,
1999, 114 (04)
:1243-1284
[8]
[Anonymous], 2010, Science and Engineering Indicators 2010
[9]
[Anonymous], 2004, SCI ENG IND 2004
[10]
Barnett T, 2000, S AFR MED J, V90, P1098