Lower bounds for Schrödinger equations
Journées équations aux dérivées partielles (1982), article no. 7, 7 p. 
@article{JEDP_1982____A7_0,
     author = {Fefferman, Charles and Phong, D. H.},
     title = {Lower bounds for {Schr\"odinger} equations},
     journal = {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://archive.numdam.org/item/JEDP_1982____A7_0/}
}
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Fefferman, Charles; Phong, D. H. Lower bounds for Schrödinger equations. Journées équations aux dérivées partielles (1982), article  no. 7, 7 p. http://archive.numdam.org/item/JEDP_1982____A7_0/

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[2] C. Fefferman, E. M. Stein : Hp spaces in several variables, Acta Math. 129 (1972), pp. 137-193. | MR | Zbl