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@article{Authenticus:P-00Y-RRT,
	title = {{Nonnegative elements of subgroups of ℤn}},
	author = {Rosales J. and García-Sánchez P.},
	doi = {10.1016/s0024-3795(97)00309-1},
	journal = {Linear Algebra and Its Applications},
	number = {1-3},
	pages = {351-357},
	publisher = {Elsevier BV},
	type = {Article},
	volume = {270},
	year = {1998}
}