V. Keränen, Abelian squares are avoidable on 4 letters, Proc. ICALP '92, Lecture Notes in Comp. Sci. 623, Springer, Berlin (1992), pp. 41–52

Keränen's infinite word is given as the fixed point of a 85-uniform morphism h defined by:

h(0)=012023212320323130102010310121312102123202101301020321232 0231210212320232132303132120

-- StepanHolub - 10 Mar 2012