@article{SF_1993__46_1_135233,
     author = {W. Gaspers and P. Cl\'ement},
     title = {Point interactions  in {Lp} .},
     journal = {Semigroup forum},
     pages = {253--265},
     year = {1993},
     volume = {46},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135233/}
}