@article{Head_1987,
    doi = {10.1007/bf02481771},
    url = {https://doi.org/10.1007%2Fbf02481771},
    year = {1987},
    month = {nov},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {49},
    number = {6},
    pages = {737--759},
    author = {Tom Head},
    title = {Formal language theory and {DNA}: An analysis of the generative capacity of specific recombinant behaviors},
    journal = {Bulletin of Mathematical Biology}
}

@article{Head_1987, doi = {10.1007/bf02481771}, url = {https://doi.org/10.1007%2Fbf02481771}, year = {1987}, month = {nov}, publisher = {Springer Science and Business Media {LLC}}, volume = {49}, number = {6}, pages = {737--759}, author = {Tom Head}, title = {Formal language theory and {DNA}: An analysis of the generative capacity of specific recombinant behaviors}, journal = {Bulletin of Mathematical Biology} }