Stål Aanderaa, Egon Börger, Harry R. Lewis. Conservative Reduction Classes of Krom Formulas. Journal of Symbolic Logic, 47(1):110-130, 1982.
@article{AanderaaBL82, title = {Conservative Reduction Classes of Krom Formulas}, author = {Stål Aanderaa and Egon Börger and Harry R. Lewis}, year = {1982}, researchr = {https://researchr.org/publication/AanderaaBL82}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {47}, number = {1}, pages = {110-130}, }