@article{Beck_1994,
    doi = {10.1016/0377-0427(94)90294-1},
    url = {https://doi.org/10.1016%2F0377-0427%2894%2990294-1},
    year = {1994},
    month = {may},
    publisher = {Elsevier {BV}},
    volume = {50},
    number = {1-3},
    pages = {119--131},
    author = {Thomas Beck and Herbert Fischer},
    title = {The if-problem in automatic differentiation},
    journal = {Journal of Computational and Applied Mathematics}
}

@article{Beck_1994, doi = {10.1016/0377-0427(94)90294-1}, url = {https://doi.org/10.1016%2F0377-0427%2894%2990294-1}, year = {1994}, month = {may}, publisher = {Elsevier {BV}}, volume = {50}, number = {1-3}, pages = {119--131}, author = {Thomas Beck and Herbert Fischer}, title = {The if-problem in automatic differentiation}, journal = {Journal of Computational and Applied Mathematics} }