Singularities of the scattering kernel for non convex obstacles
Journées équations aux dérivées partielles (1987), article no. 11, 10 p. 
@article{JEDP_1987____A11_0,
     author = {Petkov, Vesselin M. and Stoyanov, Luchezar N.},
     title = {Singularities of the scattering kernel for non convex obstacles},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {11},
     pages = {1--10},
     publisher = {Ecole polytechnique},
     year = {1987},
     mrnumber = {89a:58108},
     zbl = {0639.35065},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1987____A11_0/}
}
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Petkov, Vesselin M.; Stoyanov, Luchezar N. Singularities of the scattering kernel for non convex obstacles. Journées équations aux dérivées partielles (1987), article  no. 11, 10 p. http://archive.numdam.org/item/JEDP_1987____A11_0/

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