1. Stoichiometric Laser Materials;Danielmeyer,1975
2. CW laser action in acentric NdAl3(BO3)4 and KNdP4O12
3. Current Topics in Materials Science;Huber,1978
4. G. Huber, F. Lutz and M. Leiss, to be published.
5. H.-D. Hattendorff, private communication.