The propagation of singularities for pseudo-differential operators with self-tangential characteristics
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1987-1988), Exposé no. 13, 14 p. 
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     title = {The propagation of singularities for pseudo-differential operators with self-tangential characteristics},
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     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1987-1988},
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     zbl = {0682.35110},
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     url = {http://archive.numdam.org/item/SEDP_1987-1988____A13_0/}
}
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Dencker, N. The propagation of singularities for pseudo-differential operators with self-tangential characteristics. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1987-1988), Exposé no. 13, 14 p. http://archive.numdam.org/item/SEDP_1987-1988____A13_0/

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