Existence of positive harmonic functions on groups and on covering manifolds
Annales de l'I.H.P. Probabilités et statistiques, Tome 31 (1995) no. 1, pp. 59-80. 
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     title = {Existence of positive harmonic functions on groups and on covering manifolds},
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     pages = {59--80},
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     number = {1},
     year = {1995},
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     zbl = {0833.22006},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1995__31_1_59_0/}
}
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Bougerol, Philippe; Elie, Laure. Existence of positive harmonic functions on groups and on covering manifolds. Annales de l'I.H.P. Probabilités et statistiques, Tome 31 (1995) no. 1, pp. 59-80. http://www.numdam.org/item/AIHPB_1995__31_1_59_0/

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