@incollection{JEDP_1987____A1_0, author = {H\"ormander, Lars}, title = {Remarks on the {Klein-Gordon} equation}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {1}, pages = {1--9}, publisher = {Ecole polytechnique}, year = {1987}, zbl = {0655.35057}, language = {en}, url = {http://www.numdam.org/item/JEDP_1987____A1_0/} }
Hörmander, Lars. Remarks on the Klein-Gordon equation. Journées équations aux dérivées partielles (1987), article no. 1, 9 p. http://www.numdam.org/item/JEDP_1987____A1_0/
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