@article{  
   author = {P. Baldi},
   title = {Neural Networks, Acyclic Orientations of the Hypercube and Sets of Orthogonal Vectors.},
   journal = {SIAM Journal of Discrete Mathematics},
   volume = {1},
   number = {1},
   pages = {1-13},
   note = {},
   abstract = {},
   keywords = {},
   year = {1988}
}