Mathematical Notes
Mathematical Notes > 2006 > 79 > 1-2 > 268-282
Mathematical Notes > 2014 > 96 > 1-2 > 187-198
Mathematical Notes > 2015 > 97 > 1-2 > 243-248
Mathematical Notes > 2015 > 97 > 3-4 > 632-640
Mathematical Notes > 2015 > 98 > 1-2 > 38-52
Mathematical Notes > 2015 > 98 > 1-2 > 331-335
Mathematical Notes > 2016 > 100 > 3-4 > 391-402
Mathematical Notes > 2017 > 102 > 3-4 > 403-416
Mathematical Notes > 2019 > 106 > 3-4 > 468-472