@article{SMJ2_2004_30_2-3_a2,
     author = {Gerritzen, L.},
     title = {Automorphisms of the {Planar} {Tree} {Power} {Series} {Algebra} and the {Non-Associative} {Logarithm}},
     journal = {Serdica Mathematical Journal},
     pages = {135--158},
     publisher = {mathdoc},
     volume = {30},
     number = {2-3},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2004_30_2-3_a2/}
}