@ARTICLE{Skowronek2009a,
title = {{P}ositive maps, positive polynomials and entanglement witnesses},
url = {http://stacks.iop.org/1751-8121/42/i=32/a=325302},
timestamp = {2013.10.28},
journal = {Journal of Physics A: Mathematical and Theoretical},
author = {\L{}ukasz Skowronek and Karol \.Zyczkowski},
volume = {42},
year = {2009},
owner = {lacek},
pages = {325302},
number = {32}
}