Mathematical Notes
Mathematical Notes > 2002 > 72 > 1-2 > 152-157
Mathematical Notes > 2003 > 73 > 1-2 > 212-217
Mathematical Notes > 2004 > 76 > 1-2 > 124-132
Mathematical Notes > 2005 > 78 > 1-2 > 14-22
Mathematical Notes > 2006 > 80 > 5-6 > 748-752
Mathematical Notes > 2015 > 97 > 5-6 > 791-802
Mathematical Notes > 2016 > 99 > 3-4 > 590-597