Peter Poechmueller Manfred Glesner An approach for multilevel logic cell optimization in module generators. 284-289 1991 Great Lakes Symposium on VLSI https://doi.org/10.1109/GLSV.1991.143980 conf/glvlsi/1991 db/conf/glvlsi/glvlsi1991.html#PoechmuellerG91