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reference. Haskell-style type classes with isabelle/isar [haftmann2013haskell]

@misc{haftmann2013haskell,
 title = {Haskell-style type classes with Isabelle/Isar},
 author = {Haftmann, Florian},
 year = {2013},
 urtl = {https://isabelle.in.tum.de/doc/classes.pdf}
}