Hans Georg Feichtinger/K. Gro''chenig: A unified approach to atomic
characterizations via integrable group representations.
Springer LN Math. 1302 (1988), 52-73.

Hans Georg Feichtinger/K. Gro''chenig: Banach spaces related to integrable
group representations and their atomic decompositions I-II.
J. Funct. Analysis 86 (1989), 307-340;
Monatshefte Math. 108 (1989), 129-148.

Hans Georg Feichtinger/K. Gro''chenig: Non-orthogonal wavelet and Gabor
expansions, and group representations. In Beylkin a.o. 1992, ...

K. Gro''chenig: Describing functions - atomic decompositions versus
frames. Preprint, ca. 1992.