.ds b \^ .ds M \fB .if t .if !\nd .ds M \fM \" typesetter .ds El \fR.\^.\^.\fP .de DS .nf .sp .in +.5i .ft B .if t \\*M\c .. .de DE .sp .in .ft R .fi .. .de CS .if t .if \\nd .cs B 20 \ "itroff or vtroff .if t .if !\\nd .cs M 10 \" typesetter .. .de CE .if t .if \\nd .cs B .if t .if !\\nd .cs M .. .de Ib Griswold, Ralph E. and Madge T. Griswold. \fIThe Icon Programming Language\fR, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1983. .. .de St Hanson, David R. \fISoftware Tools User's Manual\fR, Technical Report TR 81-20, Department of Computer Science, The University of Arizona. 1981. .de Pd Griswold, Ralph E. and Michael Novak. ``Programmer-Defined Control Operations'', \fIThe Computer Journal\fR, Vol. 26, No. 2 (1983), pp. 175-183. .. .de Ex Griswold, Ralph E., Robert K. McConeghy, and William H. Mitchell. \fIExtensions to Version 5 of the Icon Programming Language\fR, TR 84-10a, Department of Computer Science, The University of Arizona, 1984. .. .ta .75i