On a necessity of extending the concept of equivalence in mathematical models

@article{Danilevich2000OnAN,
  title={On a necessity of extending the concept of equivalence in mathematical models},
  author={Ya. B. Danilevich and Yu.P. Petrov},
  journal={Doklady Physics},
  year={2000},
  volume={45},
  pages={164-166}
}