Mathematical Notes
Mathematical Notes > 2003 > 73 > 1-2 > 228-239
Mathematical Notes > 2004 > 76 > 5-6 > 855-858
Mathematical Notes > 2005 > 78 > 3-4 > 364-374
Mathematical Notes > 2005 > 78 > 3-4 > 577-580
Mathematical Notes > 2006 > 80 > 1-2 > 57-64
Mathematical Notes > 2013 > 94 > 1-2 > 205-213
Mathematical Notes > 2013 > 94 > 3-4 > 451-454
Mathematical Notes > 2015 > 97 > 3-4 > 349-361
Mathematical Notes > 2015 > 98 > 3-4 > 503-514
Mathematical Notes > 2015 > 98 > 5-6 > 765-777
Mathematical Notes > 2016 > 99 > 3-4 > 608-610
Mathematical Notes > 2017 > 102 > 3-4 > 521-532