About this article
Published Online: Apr 26, 2012
Page range: 233 - 239
DOI: https://doi.org/10.2478/v10037-011-0032-3
This content is open access.
Keiko Narita
Hirosaki-city, Aomori, Japan
Artur Kornilowicz
Institute of Informatics, University of Białystok, Sosnowa 64, 15-887 Białystok, Poland
Yasunari Shidama
Shinshu University, Nagano, Japan