Mathematical Notes
Mathematical Notes > 2002 > 72 > 3-4 > 473-478
Mathematical Notes > 2005 > 78 > 1-2 > 258-263
Mathematical Notes > 2005 > 78 > 1-2 > 170-184
Mathematical Notes > 2006 > 80 > 1-2 > 199-203
Mathematical Notes > 2016 > 99 > 3-4 > 432-443
Mathematical Notes > 2016 > 99 > 3-4 > 603-607
Mathematical Notes > 2016 > 100 > 3-4 > 507-514
Mathematical Notes > 2018 > 104 > 3-4 > 508-517