no. 2
Moyennes invariantes s'annulant sur des idéaux
Compositio Mathematica, Tome 42 (1980) no. 2, pp. 213-216. 
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     author = {Talagrand, Michel},
     title = {Moyennes invariantes s'annulant sur des id\'eaux},
     journal = {Compositio Mathematica},
     pages = {213--216},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {42},
     number = {2},
     year = {1980},
     mrnumber = {596876},
     zbl = {0445.43001},
     language = {fr},
     url = {http://archive.numdam.org/item/CM_1980__42_2_213_0/}
}
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Talagrand, Michel. Moyennes invariantes s'annulant sur des idéaux. Compositio Mathematica, Tome 42 (1980) no. 2, pp. 213-216. http://archive.numdam.org/item/CM_1980__42_2_213_0/

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[2] F.P. Greenleaf: Invariant means on topological groups and their applications. Van Nostrand Math. studies 16, Van Nostrand, 1969. | MR | Zbl

[3] J.M. Rosenblatt: Invariant Means and Invariant Ideals in L∞(G) for a locally compact group G, J. Funct. Anal., 21, (1976) 31-51. | Zbl

[4] M. Talagrand: Géométrie des simplexes des moyennes. (A paraitre dans J. of Funct. Analysis).