no. 4
Erratum Invariant measures for Markov processes arising from iterated function systems with place-dependent probabilities
Annales de l'I.H.P. Probabilités et statistiques, Tome 25 (1989) no. 4, pp. 589-590. 
@article{AIHPB_1989__25_4_589_0,
     author = {Barnsley, M. F. and Demko, S. G. and Elton, J. H. and Geronimo, J. S.},
     title = {Erratum {Invariant} measures for {Markov} processes arising from iterated function systems with place-dependent probabilities},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {589--590},
     publisher = {Gauthier-Villars},
     volume = {25},
     number = {4},
     year = {1989},
     zbl = {0715.60086},
     mrnumber = {1045252},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1989__25_4_589_0/}
}
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Barnsley, M. F.; Demko, S. G.; Elton, J. H.; Geronimo, J. S. Erratum Invariant measures for Markov processes arising from iterated function systems with place-dependent probabilities. Annales de l'I.H.P. Probabilités et statistiques, Tome 25 (1989) no. 4, pp. 589-590. http://www.numdam.org/item/AIHPB_1989__25_4_589_0/

R.P. Boas, A Primer of Real Functions, Wiley, 1970.