"A table is in 5NF if it is in 4NF and contains no related multi-valued dependencies." (Rod Stephens, "Beginning Database Design Solutions", 2008)
"A table is in fifth normal form (5NF) if and only if there are no possible lossless decompositions into any subset of tables; in other words, if there is no possible lossless decomposition, then the table is in 5NF." (Toby J Teorey, ", Database Modeling and Design" 4th Ed., 2010)
"Specifies that every join dependency for the entity must be a consequence of its candidate keys." (Craig S Mullins, "Database Administration", 2012)
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