@incollection{Ollinger_2009,
    doi = {10.1007/978-3-642-00982-2_54},
    url = {https://doi.org/10.1007%2F978-3-642-00982-2_54},
    year = {2009},
    publisher = {Springer Berlin Heidelberg},
    pages = {638--647},
    author = {Nicolas Ollinger},
    title = {Tiling the Plane with a Fixed Number of Polyominoes},
    booktitle = {Language and Automata Theory and Applications}
}

@incollection{Ollinger_2009, doi = {10.1007/978-3-642-00982-2_54}, url = {https://doi.org/10.1007%2F978-3-642-00982-2_54}, year = {2009}, publisher = {Springer Berlin Heidelberg}, pages = {638--647}, author = {Nicolas Ollinger}, title = {Tiling the Plane with a Fixed Number of Polyominoes}, booktitle = {Language and Automata Theory and Applications} }