@patent{PP87, <br>AUTHOR = {Paul, W.J. and Pippenger, N.},<br>TITLE = {Modified crossbar switch operation with fixed priority conflict resolution and apparatus for performing same},<br>VOLUME = {4,663,620}, <br>YEAR = {1987},<br>URL = {http:///publikationen/PP87.pdf}, <br>SERIES = {United States Patent},<br>}