@incollection{JEDP_1996____A10_0,
     author = {Dencker, Nils},
     title = {The solvability of non $L^2$ solvable operators},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--11},
     publisher = {Ecole polytechnique},
     year = {1996},
     mrnumber = {97i:35201},
     zbl = {0885.35151},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1996____A10_0/}
}