Search results for: Piotr Niemiec
Open Mathematics > 2014 > 12 > 6 > 887-895
Central European Journal of Mathematics > 2014 > 12 > 6 > 887-895
Open Mathematics > 2013 > 11 > 7 > 1304-1316
Central European Journal of Mathematics > 2013 > 11 > 7 > 1304-1316