@article{Gittenberger2018896, title = "On the shape of random Pólya structures ", journal = "Discrete Mathematics ", volume = "341", number = "4", pages = "896 - 911", year = "2018", note = "", issn = "0012-365X", doi = "https://doi.org/10.1016/j.disc.2017.12.016", url = "https://www.sciencedirect.com/science/article/pii/S0012365X17304326", author = "Bernhard Gittenberger and Emma Yu Jin and Michael Wallner", keywords = "Pólya tree", keywords = "Pólya enumeration theorem", keywords = "Simply generated tree", keywords = "Rooted identity tree", keywords = "Automorphism group of trees " }