@techreport{PtolemyVol1:04,
   Author = {Brooks, C. and Lee, E. A. and Liu, X. and Neuendorffer, S. and Zhao, Y. and Zheng, H.},
   Title = {Heterogeneous Concurrent Modeling and Design in Java},
   Institution = {University of California},
   Number = {Technical Memorandum UCB/ERL M04/27},
   Month= {July 29},
   URL ={http://ptolemy.eecs.berkeley.edu/publications/papers/04/ptIIDesignIntro/},
   Year = {2004}
}