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References

  1. C. C. Chang, B. Jónsson, A. Tarski, Refinement properties for relational structures,Fund. Math.,55 (1964), pp. 249–281.

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Lovász, L. Operations with structures. Acta Mathematica Academiae Scientiarum Hungaricae 18, 321–328 (1967). https://doi.org/10.1007/BF02280291

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  • DOI: https://doi.org/10.1007/BF02280291

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