@article{10_4064_sm193_2_3,
     author = {J. Alaminos and M. Bre\v{s}ar and J. Extremera and A. R. Villena},
     title = {Maps preserving zero products},
     journal = {Studia Mathematica},
     pages = {131--159},
     year = {2009},
     volume = {193},
     number = {2},
     doi = {10.4064/sm193-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm193-2-3/}
}