@article{700399,
     title = {Finite time singularities in transport equations with nonlocal velocities and fluxes},
     booktitle = {Proceedings of Equadiff 11},
     series = {GDML\_Books},
     publisher = {Comenius University Press},
     address = {Bratislava},
     year = {2007},
     pages = {97-104},
     url = {http://dml.mathdoc.fr/item/700399}
}

Córdoba, Antonio; Córdoba, Diego; Fontelos, Marco A. Finite time singularities in transport equations with nonlocal velocities and fluxes, dans Proceedings of Equadiff 11, GDML_Books,  (2007), pp. 97-104. http://gdmltest.u-ga.fr/item/700399/