@article{BASS_2006_31_1_a6,
     author = {J. Toft},
     title = {Positivity in twisted convolution algebra and {Fourier} modulation spaces},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {75 - 86},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {2006},
     zbl = {1119.47040},
     url = {http://geodesic.mathdoc.fr/item/BASS_2006_31_1_a6/}
}