DOI: http://dx.doi.org/10.14510%2Flm-ns.v33i1.28.g22
		Agnese Caielli
						Dipartimento di Matematica e Applicazioni, Università degli Studi di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy			
		Arrigo Cellina
						Dipartimento di Matematica e Applicazioni,
Univeristy of Milan “Bicoccaâ€, Via Cozzi 53, 20125 Milan, Italy		
Italy	
The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).
If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.
Alternatively, you can download the PDF file directly to your computer, from where it can be opened using a PDF reader. To download the PDF, click the Download link above.