@article {HII09,
	title = {Reduction techniques for the {PNS} problems: a novel technique and a review},
	journal = {Optimization and Engineering},
	volume = {10},
	number = {3},
	year = {2009},
	pages = {351-361},
	author = {Cs. Holl{\'o} and B. Imreh and Cs. Imreh}
}
