@article{EP_2012_36_a4,
     author = {Harald Fripertinger and Ludwig Reich},
     title = {On the formal first cocycle equation for iteration groups of type {II}},
     journal = {ESAIM. Proceedings},
     pages = {32--47},
     year = {2012},
     volume = {36},
     doi = {10.1051/proc/201236004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201236004/}
}