Primera forma normal (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Primera forma normal" in Spanish language version.

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bkent.net

"First normal form excludes variable repeating fields and groups." Kent, William. "A Simple Guide to Five Normal Forms in Relational Database Theory", Communications of the ACM 26 (2), Feb. 1983, pp. 120-125.

"[T]he overriding requirement, to the effect that the table must directly and faithfully represent a relation, follows from the fact that 1NF was originally defined as a property of relations, not tables." Date, C.J. "What First Normal Form Really Means" in Date on Database: Writings 2000-2006 (Springer-Verlag, 2006), p. 128.
Date, C.J. "What First Normal Form Really Means" pp. 127-128.
Date, C.J. "What First Normal Form Really Means" p. 128.
"[F]or many years," writes Date, "I was as confused as anyone else. What's worse, I did my best (worst?) to spread that confusion through my writings, seminars, and other presentations." Date, C.J. "What First Normal Form Really Means" in Date on Database: Writings 2000-2006 (Springer-Verlag, 2006), p. 108
Date, C.J. "What First Normal Form Really Means" p. 112.
Date, C.J. "What First Normal Form Really Means" pp. 121-126.