The authors acknowledge stimulating discussions with Dr. R.M. White who first drew our attention to the subject of chaos in spin wave systems. We also thank Dr. K. Nakamura;
Dr;
C;
Jeffries;
Dr. F. Waldner. Dr. H. Yamazaki and Dr. F.T. Arecchi for useful correspondence and discussions. This work has been supported by FINEP;
CNPq and CAPES;