@article{Demri_2007,
    doi = {10.1016/j.ic.2006.08.003},
    url = {https://doi.org/10.1016%2Fj.ic.2006.08.003},
    year = {2007},
    month = {jan},
    publisher = {Elsevier {BV}},
    volume = {205},
    number = {1},
    pages = {2--24},
    author = {St{\'{e}}phane Demri and Ranko Lazi{\'{c}} and David Nowak},
    title = {On the freeze quantifier in Constraint {LTL}: Decidability and complexity},
    journal = {Information and Computation}
}

@article{Demri_2007, doi = {10.1016/j.ic.2006.08.003}, url = {https://doi.org/10.1016%2Fj.ic.2006.08.003}, year = {2007}, month = {jan}, publisher = {Elsevier {BV}}, volume = {205}, number = {1}, pages = {2--24}, author = {St{\'{e}}phane Demri and Ranko Lazi{\'{c}} and David Nowak}, title = {On the freeze quantifier in Constraint {LTL}: Decidability and complexity}, journal = {Information and Computation} }