Mathematical Notes
Mathematical Notes > 2001 > 69 > 3-4 > 437-466
Mathematical Notes > 2014 > 96 > 1-2 > 248-260
Mathematical Notes > 2015 > 97 > 1-2 > 42-49
Mathematical Notes > 2016 > 100 > 5-6 > 796-806
Mathematical Notes > 2017 > 102 > 3-4 > 403-416
Mathematical Notes > 2018 > 103 > 3-4 > 499-504
Mathematical Notes > 2018 > 104 > 5-6 > 810-822