Tan Watanabe Kazuko Sakuma Hideyuki Arai Kohbun Umetani Essential language el(alpha) - a reduced expression set language for system programming. 85-98 1991 26 SIGPLAN Notices 1 http://doi.acm.org/10.1145/122203.122209 db/journals/sigplan/sigplan26.html#WatanabeSAU91