@article{10_4064_sm153_2_2,
     author = {T. Downarowicz and J. Kwiatkowski},
     title = {Weak {Closure} {Theorem} fails for ${\Bbb Z}^2$-actions},
     journal = {Studia Mathematica},
     pages = {115--125},
     year = {2002},
     volume = {153},
     number = {2},
     doi = {10.4064/sm153-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm153-2-2/}
}