About this article
Published Online: Apr 12, 2014
Page range: 12 - 37
DOI: https://doi.org/10.2478/perc-2013-0008
Keywords
© 2014
This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Stafford, John K.