Ángel Luis García Fernández Juan Ruiz de Miras F. R. Fieto Free-form solid modelling based on extended simplicial chains using triangular Bézier patches. 27-39 2003 27 Computers & Graphics 1 http://dx.doi.org/10.1016/S0097-8493(02)00222-4 db/journals/cg/cg27.html#GarciaMF03