Geodesic
Transversals of rectangular arrays
Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 2 
S. Szabó. Transversals of rectangular arrays. Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 2. http://geodesic.mathdoc.fr/item/AMUC_2008_77_2_a11/
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     author = {S. Szab\'o},
     title = {Transversals of rectangular arrays},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2008},
     volume = {77},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2008_77_2_a11/}
}
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The paper deals with m by n rectangular arrays whose mn cells are filled with symbols. A section of the array consists of m cells, one from each row and no two from the same column. The paper focuses on the existence of sections that do contains symbols with high multiplicity.