Rights:
© 2001 American Physical Society (APS). This is the accepted version of the following article: Puska, Martti J. & Ogando, E. & Zabala, N. 2001. Shell and supershell structures of nanowires: A quantum-mechanical analysis. Physical Review B. Volume 64, Issue 3. 033401/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.64.033401, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.64.033401.