1991

Langhals, Heinz and Demmig, Stefan and Potrawa, Thomas (1991): The Relation between Packing Effects and Solid State Fluorescence of Dyes. In: Journal für Praktische Chemie, Vol. 333, No. 5: pp. 733-748

1988

Demmig, Stefan and Langhals, Heinz (1988): Leichtlösliche, lichtechte Perylen-Fluoreszenzfarbstoffe. In: Chemische Berichte, Vol. 121, No. 2: pp. 225-230

Langhals, Heinz and Demmig, Stefan and Huber, Helmut (1988): Rotational barriers in perylene fluorescent dyes. In: Spectrochimica Acta Part A: Molecular Spectroscopy, Vol. 44, No. 11: pp. 1189-1193