Preparation theorems for systems
Journées équations aux dérivées partielles (1990), article no. 9, 10 p. 
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     author = {Dencker, Nils},
     title = {Preparation theorems for systems},
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     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {9},
     pages = {1--10},
     publisher = {Ecole polytechnique},
     year = {1990},
     mrnumber = {91g:32008},
     zbl = {0716.58006},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1990____A9_0/}
}
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Dencker, Nils. Preparation theorems for systems. Journées équations aux dérivées partielles (1990), article  no. 9, 10 p. http://archive.numdam.org/item/JEDP_1990____A9_0/

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