@article{Ver:rtsj97,
   author = "Ver\'{\i}ssimo, P. and Rodrigues, L. and Casimiro, A.",
   journal = "Journal of Real-Time Systems",
   publisher = "Kluwer Academic Publishers",
   title = "CesiumSpray: a Precise and Accurate Global Time Service for Large-scale Systems",
   volume = "12",
   number = "3",		   
   pages = "243-294",
   year = "1997",
}