Derivation of root forms: What Saami morphology tells us about paradigm generation
Peter Svenonius

Northern Saami consonant gradations (CGs) defy simple phonological solutions. Yet they affect roots, pervasively and productively, even applying to new loan words. Since CG is productive, listing of root allomorphs is not an option. Since CG is not phonologically simple, a complex morphophonology is needed.