Jesús M. González-Barahona José Centeno-González Pedro de las Heras Quirós Francisco J. Ballesteros-Cámara Luis Lóopez-Fernández Teaching Network Programming with Ada and <i>Lower_Layer</i>. 105-110 1997 TRI-Ada http://doi.acm.org/10.1145/269629.269640 db/conf/sigada/triada97.html#Gonzalez-BarahonaCQBL97