@article{  
   author = {P. Baldi, K. Hornik},
   title = {Neural Networks and Principal Component Analysis: Learning from Examples without Local Minima.},
   journal = {Neural Networks},
   volume = {2},
   number = {1},
   pages = {53-58},
   note = {},
   abstract = {},
   keywords = {},
   year = {1988}
}