1. Universidade do Recife, Brasil
2. Corpus Christi College, Oxford
3. Boeing Scientific Research Laboratories, Seattle, Washington
4. Regional Engineering College, Warangal (A.P.), India
5. Houghton College
6. University of Bucharest
7. University of Rochester
8. Miami University, Oxford, Ohio
9. Indiana University
10. Pennsylvania State University
11. National Bureau of Standards
12. University of California, Riverside
13. University of Pittsburgh