TY - JOUR AU - Hélein, Frédéric TI - Phenomena of compensation and estimates for partial differential equations JO - Documenta mathematica PY - 1998 SP - 21 EP - 30 VL - ICM Berlin 1998, Vol. III PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DOCMA_1998__S9__a76/ LA - en ID - DOCMA_1998__S9__a76 ER -