@ARTICLE\{IMM1993-04403,
    author       = "J. Spars{\o} and J. Staunstrup",
    title        = "Delay-insensitive Multi-ring Structures",
    year         = "1993",
    pages        = "313-340",
    journal      = "Integration, the {VLSI} journal",
    volume       = "15",
    editor       = "",
    number       = "3",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4403-full.html"
}