Extensions of $k$-subsets to $k+1$-subsets - existence versus constructability
Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 2, pp. 337-349.

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Classification : 03D15, 05-04, 05A05, 05C38, 68C05, 68R99
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     title = {Extensions of $k$-subsets to $k+1$-subsets - existence versus constructability},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {337--349},
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Poljak, Svatopluk; Turzík, Daniel; Pudlák, Pavel. Extensions of $k$-subsets to $k+1$-subsets - existence versus constructability. Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 2, pp. 337-349. http://geodesic.mathdoc.fr/item/CMUC_1982__23_2_a9/