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@incollection{JEDP_1982____A7_0, author = {Fefferman, Charles and Phong, D. H.}, title = {Lower bounds for {Schr\"odinger} equations}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {7}, pages = {1--7}, publisher = {\'Ecole polytechnique}, year = {1982}, zbl = {0492.35057}, language = {en}, url = {http://geodesic.mathdoc.fr/item/JEDP_1982____A7_0/} }
Fefferman, Charles; Phong, D. H. Lower bounds for Schrödinger equations. Journées équations aux dérivées partielles (1982), article no. 7, 7 p. http://geodesic.mathdoc.fr/item/JEDP_1982____A7_0/