Mathematical Notes
Mathematical Notes > 2001 > 69 > 1-2 > 196-206
Mathematical Notes > 2003 > 74 > 3-4 > 411-421
Mathematical Notes > 2013 > 94 > 3-4 > 369-378
Mathematical Notes > 2016 > 100 > 5-6 > 751-754
Mathematical Notes > 2017 > 101 > 1-2 > 39-47
Mathematical Notes > 2017 > 102 > 3-4 > 424-428
Mathematical Notes > 2018 > 104 > 5-6 > 762-766
Mathematical Notes > 2019 > 106 > 3-4 > 402-411