TY - JOUR AU - Sette Diop TI - Closedness of morphisms of differential algebraic sets. Applications to system theory. JO - Forum mathematicum PY - 1993 SP - 33 EP - 48 VL - 5 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FORUM_1993__5_3_141698/ ID - FORUM_1993__5_3_141698 ER -