DOE:10.5012/bkcs.2010.31.04.1025
DOE:10.5012/bkcs.2011.32.8.2571
DOE:10.5012/bkcs.2012.33.10.3349
DOE:10.5012/bkcs.2013.34.2.553
DOE:10.5012/bkcs.2013.34.7.1995