@article(2007-efficient-bp-algorithms-for-general-feedforward-neural-networks,
  author = {Salvador España Boquera and Francisco Julian Zamora Martínez and María José Castro Bleda and Jorge Gorbe Moya},
  title = {Efficient BP Algorithms for General Feedforward Neural Networks},
  year = {2007},
  journal = {Lecture Notes in Computer Science},
  volume = {4527},
  pages = {327-336}
)