A new procedure for mixed integer programming is presented. It is applicable where the integer variables must be either zero or one, and where the integer variables are divided into sets such that the ...

The variable in the RANGE statement, the ID variables, and the BY variables are available for the model program to examine, but their values should not be changed by the program.

Charles O. Crawford, Functions of Independent Variables in Research and Program Planning, Public Health Reports (1896-1970), Vol. 84, No. 9 (Sep., 1969), pp. 831-834 ...