A triangle-based logic for affine-invariant querying of spatial and spatio-temporal data

Sofie Haesevoets Bart Kuijpers A triangle-based logic for affine-invariant querying of spatial and spatio-temporal data http://arxiv.org/abs/0810.5725 2008 CoRR abs/0810.5725 db/journals/corr/corr0810.html#abs-0810-5725 informal publication