This program was written as a substitute for MIFRl. There are four notable differences: i) no symmetry manipulations are performed; ii) no sorting is made with regard to sine-cosine codes; iii) summation is done completely in each direction before proceeding; iv) program is for the IBM 7074 (20K).
Ledet, Mads, "Mfour crystallographic fourier summation program" (1964). Ames Laboratory Technical Reports. 62.