@article{CM_1978__36_2_209_0,
     author = {Dyer, Micheal N.},
     title = {On the essential height of homotopy trees with finite fundamental group},
     journal = {Compositio Mathematica},
     pages = {209--224},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {36},
     number = {2},
     year = {1978},
     mrnumber = {515046},
     zbl = {0375.55008},
     language = {en},
     url = {http://www.numdam.org/item/CM_1978__36_2_209_0/}
}