@misc {IOPORT.70755140,
    author       = {Sierra, Jos\'e Mar{\'\i}a and Castro, Julio C\'esar Hern\'andez and Izquierdo, Antonio and Ribagorda, Arturo},
    title        = {Secure communications in multi-agent systems protecting KQML},
    howpublished = {WOSIS, 305-313 (2004).},
    year         = {2004},
    identifier   = {70755140},
}