Open Mathematics
Open Mathematics > 2005 > 3 > 1 > 83-97
Open Mathematics > 2007 > 5 > 3 > 484-492
Open Mathematics > 2011 > 9 > 6 > 1298-1311
Open Mathematics > 2011 > 9 > 6 > 1380-1388
Open Mathematics > 2014 > 12 > 6 > 896-910
Open Mathematics > 2016 > 14 > 1 > 324-337