Rights:
© 1982 American Physical Society (APS). This is the accepted version of the following article: Hakonen, Pertti J. & Ikkala, O. T. & Islander, S. T. 1982. Experiments on Vortices in Rotating Superfluid 3He-A. Physical Review Letters. Volume 49, Issue 17. 1258-1261. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.49.1258, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.49.1258.