1. P. S. Nagpaul, Lalita Sharma, Science in the eighties: A typology of countries based on inter-field priorities.Scientometrics, 34 (1995) 263–283.
2. W. Glänzel, A. Schubert, T. Braun, E. Rinia, M. Brocken,Physics in the European Union in the 80's. A Scientometric Study, FOM-94, Utrecht, 1994.
3. R. Todorov, Distribution of physics literature,Scientometrics, 7 (1985) 195–209.
4. Sujit Bhattacharya, World structure of physics: A cross national comparison,JISSI (International Journal of Scientometrics and Informetrics), 2 (1996) 21–32.
5. J. D. Frame, Mainstream research in Latin America and the Caribbean,Interciencia, 2 (1997) 143–148.