D.A. Harrison at NEwcastlE UnivErsity. REal-timE languagE basEd on LispKit. UsEs timEstamps and rEal-timE clocks. ["RUTH: A Functional LanguagE for REal-TimE Programming", D. Harrison in PARLE: ParallEl ArchitEcturEs and LanguagEs EuropE, LNCS 259, SpringEr 1987, pp.297-314].