@article {BHI98a,
	title = {Explicit bounds for the number of feasible solutions of special {PNS}-problem classes},
	journal = {Pure Mathematics and Applications},
	volume = {9},
	year = {1998},
	pages = {17-27},
	author = {Z. Bl{\'a}zsik and Cs. Holl{\'o} and B. Imreh}
}
