Abel function/Bibliography

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The original article:

• N. H. Abel (1881). “Détermination d'une fonction au moyen d'une équation qui ne contient qu'une seule variable”, Œuvres complètes, tome 2. Christiana: Grøndahl & Søn, 36–39. 

Textbook:

• Marek Kuczma, Bogdan Choczewski, Roman Ger (2008). Iterative Functional Equations,, 127. 

Use of the terminology for real functions:

• G. Szekeres (1998). "Abel's equation and regular growth: Variations of a theme by Abel". Experimental mathematics 7 (2): 85–100.