Аннотация:ISSN 1911-2017; E-ISSN 1911-2025. Published by Canadian Center of Science and Education. Received: June 22, 2014 Accepted: July 15, 2014 Online Published: September 24, 2014. Received: June 20, 2014 Accepted: July 16, 2014 Online Published: September 24, 2014. doi:10.5539/ass.v10n20p1. Ссылки http://www.ccsenet.org/journal/index.php/ass/article/view/40806/22527