1. Complexity of scheduling problems with multi-purpose machines;Brucker;Annals of Operations Research,1997
2. Brucker P. Complexity results for scheduling problems. http://www.mathematik.uni-osnabrueck.de/research/OR/class/pdf/pqr_nop.pdf. From http://www.mathematik.uni-osnabrueck.de/research/OR/class/.
3. A class of generalized multiprocessor scheduling problems;Yang;Systems Science and Mathematical Sciences,2000
4. Hybrid flow shop scheduling with specialist machines. PhD thesis, Department of Mathematics;Mills,2002
5. Minimizing average flow time with parallel machines;Horn;Operations Research,1973