The propagation of singularities for pseudo-differential operators with self-tangential characteristics
Séminaire Goulaouic-Schwartz (1987-1988), Exposé no. 13, 14 p. 
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     author = {Dencker, N.},
     title = {The propagation of singularities for pseudo-differential operators with self-tangential characteristics},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:13},
     pages = {1--14},
     year = {1987-1988},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
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     zbl = {0682.35110},
     language = {en},
     url = {https://www.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 Goulaouic-Schwartz (1987-1988), Exposé no. 13, 14 p.. https://www.numdam.org/item/SEDP_1987-1988____A13_0/

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