@article{10_4064_sm155_1_6,
     author = {M. A. Chebotar and W.-F. Ke and P.-H. Lee and N.-C. Wong},
     title = {Mappings preserving zero products},
     journal = {Studia Mathematica},
     pages = {77--94},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {2003},
     doi = {10.4064/sm155-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm155-1-6/}
}