Consider the following sentences, which could have appeared as such in academic texts:
Obiges Zitat ist aufschlussreich. Genanntes Beispiel hilft uns weiter. Besagte Theorie wurde schon längst widerlegt.
These sentences turn ungrammatical as soon as we remove "obiges", "genanntes" or "besagtes". Furthermore, the noun phrases are definite (in contrast to, say "honey"). This leads to the conclusion that the leading words of the sentences ain't adjectives but determiners.
I believe it is a curious feature that German has a set of determiners (thus, grammatical words) that are derived from adjectives and only occur in literal and formal language. Something similar is the case for 'aforesaid' in English, compare Wiktionary.
Is there academic work on this?
How did these forms evolve?
PS: I just noticed to following description of the tag 'article' : "An article is a word that precedes a noun and determines its gender." It should be known that this is nonsense.