Search results
Demonstratio Mathematica > 2019 > Vol. 52, nr 1 > 20--28
Journal of Mathematical Analysis and Applications > 2015 > 422 > 2 > 1335-1341
Acta Mathematica Sinica, English Series > 2015 > 31 > 9 > 1461-1474
Semigroup Forum > 2013 > 87 > 2 > 428-436