Viorel Milea Michael Mrissa Kees van der Sluijs Uzay Kaymak On Temporal Cardinality in the Context of the TOWL Language. 457-466 2008 ER Workshops http://dx.doi.org/10.1007/978-3-540-87991-6_53 conf/er/2008w db/conf/er/erw2008.html#MileaMSK08