@incollection{BonsangueRuttenWinter:CMCS:2012,
    doi = {10.1007/978-3-642-32784-1_2},
    url = {https://doi.org/10.1007%2F978-3-642-32784-1_2},
    year = {2012},
    publisher = {Springer Berlin Heidelberg},
    pages = {20--39},
    author = {Marcello M. Bonsangue and Jan Rutten and Joost Winter},
    title = {Defining Context-Free Power Series Coalgebraically},
    booktitle = {Coalgebraic Methods in Computer Science}
}

@incollection{BonsangueRuttenWinter:CMCS:2012, doi = {10.1007/978-3-642-32784-1_2}, url = {https://doi.org/10.1007%2F978-3-642-32784-1_2}, year = {2012}, publisher = {Springer Berlin Heidelberg}, pages = {20--39}, author = {Marcello M. Bonsangue and Jan Rutten and Joost Winter}, title = {Defining Context-Free Power Series Coalgebraically}, booktitle = {Coalgebraic Methods in Computer Science} }