@article{BMMS_2013_36_1_a6,
     author = {Seok-Zun Song and Mun-Hwan Kang},
     title = {Linear {Preservers} of {Extremes} of {Matrix} {Pairs} {Over} {Nonbinary} {Boolean} {Algebra}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_1_a6/}
}