@incollection{Verbitsky,
    doi = {10.1007/978-3-540-70918-3_58},
    url = {https://doi.org/10.1007%2F978-3-540-70918-3_58},
    publisher = {Springer Berlin Heidelberg},
    pages = {682--693},
    author = {Oleg Verbitsky},
    title = {Planar Graphs: Logical Complexity and Parallel Isomorphism Tests},
    booktitle = {{STACS} 2007}
}

@incollection{Verbitsky, doi = {10.1007/978-3-540-70918-3_58}, url = {https://doi.org/10.1007%2F978-3-540-70918-3_58}, publisher = {Springer Berlin Heidelberg}, pages = {682--693}, author = {Oleg Verbitsky}, title = {Planar Graphs: Logical Complexity and Parallel Isomorphism Tests}, booktitle = {{STACS} 2007} }