@incollection{Beki_,
    doi = {10.1007/bfb0048939},
    url = {https://doi.org/10.1007%2Fbfb0048939},
    publisher = {Springer-Verlag},
    pages = {30--55},
    author = {Hans Beki{\'{c}}},
    title = {Definable operations in general algebras, and the theory of automata and flowcharts},
    booktitle = {Programming Languages and Their Definition}
}

@incollection{Beki_, doi = {10.1007/bfb0048939}, url = {https://doi.org/10.1007%2Fbfb0048939}, publisher = {Springer-Verlag}, pages = {30--55}, author = {Hans Beki{\'{c}}}, title = {Definable operations in general algebras, and the theory of automata and flowcharts}, booktitle = {Programming Languages and Their Definition} }