@incollection{Fokkink_1997,
    doi = {10.1007/3-540-63165-8_212},
    url = {https://doi.org/10.1007%2F3-540-63165-8_212},
    year = {1997},
    publisher = {Springer Berlin Heidelberg},
    pages = {571--581},
    author = {Wan Fokkink},
    title = {Axiomatizations for the perpetual loop in process algebra},
    booktitle = {Automata, Languages and Programming}
}

@incollection{Fokkink_1997, doi = {10.1007/3-540-63165-8_212}, url = {https://doi.org/10.1007%2F3-540-63165-8_212}, year = {1997}, publisher = {Springer Berlin Heidelberg}, pages = {571--581}, author = {Wan Fokkink}, title = {Axiomatizations for the perpetual loop in process algebra}, booktitle = {Automata, Languages and Programming} }