@article {BHI00, title = {On bottleneck and k-sum versions of the Process Network Synthesis problems}, journal = {Novi Sad Journal of Mathematics}, volume = {30}, number = {3}, year = {2000}, pages = {11-19}, author = {Z. Bl{\'a}zsik and Cs. Holl{\'o} and B. Imreh and Cs. Imreh and Z. Kov{\'a}cs} }