1. Einstein, A., Ideas and Opinions, Crown Publishers, New York, 1954, p. 266.
2. The University of North Carolina at Wilmington, March 1998. The word “modeling” occurred in 415 entries and “modelling” in 102 entries, with no overlap between them.
3. The University of Minnesota, March 1998. The word “modeling” occurred in 2713 entries and “modelling” in 1050 entries, with no obvious overlap between the two.
4. Ahuja, N.; Schachter, B.J., Pattern Models, John-Wiley & Sons, New York, 1983, p. ix.
5. From the preface of J.J. Granda, F.E. Cellier (eds.), International Conference on Bond Graph Modeling ICBGM ‘83, Society for Computer Simulation, 1993, p. v.