On the essential height of homotopy trees with finite fundamental group
Compositio Mathematica, Tome 36 (1978) no. 2, pp. 209-224. 
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     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://archive.numdam.org/item/CM_1978__36_2_209_0/}
}
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Dyer, Micheal N. On the essential height of homotopy trees with finite fundamental group. Compositio Mathematica, Tome 36 (1978) no. 2, pp. 209-224. http://archive.numdam.org/item/CM_1978__36_2_209_0/

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