Raquel Díaz-Caldera Joan Serrat-Fernández Klearchos Berdekas Fotis Karayannis X-type Interface for Management of Multi-domain, Multi-technology Networks. 951-952 1999 Integrated Network Management http://dx.doi.org/10.1109/INM.1999.770741 conf/im/1999 db/conf/im/im1999.html#Diaz-CalderaSBK99