@incollection{Razborov_1997,
    doi = {10.1007/978-3-642-60408-9_28},
    url = {https://doi.org/10.1007%2F978-3-642-60408-9_28},
    year = {1997},
    publisher = {Springer Berlin Heidelberg},
    pages = {385--392},
    author = {Alexander A. Razborov},
    title = {On Small Size Approximation Models},
    booktitle = {Algorithms and Combinatorics}
}

@incollection{Razborov_1997, doi = {10.1007/978-3-642-60408-9_28}, url = {https://doi.org/10.1007%2F978-3-642-60408-9_28}, year = {1997}, publisher = {Springer Berlin Heidelberg}, pages = {385--392}, author = {Alexander A. Razborov}, title = {On Small Size Approximation Models}, booktitle = {Algorithms and Combinatorics} }