@article{sacscuza:beiu1994caosfbsosfvionn,
  title={Closse Approximations of Sigmoid Functions by Sum of Step for VLSI Implementation of Neural Networks.},
  author={Valeriu BEIU, Jan A. PEPERSTRAETE, Joos VANDEWALLE, Rudy LAUWEREINS},
  journal={Scientific Annals of Computer Science},
  number={3},
  organization={``A.I. Cuza'' University, Ia\c si, Rom\^ania},
  year={1994},
  pages={5--34},
  publisher={``A.I. Cuza'' University Press, Ia\c si}
}