@misc {IOPORT.70451604,
    author       = {Nogueira, V{\'\i}tor and Abreu, Salvador},
    title        = {ISTO: A language for temporal organizational information systems},
    howpublished = {INAP, 40-51 (2009).},
    year         = {2009},
    doi          = {10.1007/978-3-642-20589-7_3},
    identifier   = {70451604},
}