1 Erratum to: Vietnam J Comput Sci DOI 10.1007/s40595-015-0045-x
The family name of the first author was misspelled in the original article.
The correct family name is given above.
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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.