no. 1
The cardinality of the set of invariant means on a locally compact topological semigroup
Compositio Mathematica, Tome 54 (1985) no. 1, pp. 41-49 
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     title = {The cardinality of the set of invariant means on a locally compact topological semigroup},
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     pages = {41--49},
     year = {1985},
     publisher = {Martinus Nijhoff Publishers},
     volume = {54},
     number = {1},
     mrnumber = {782384},
     zbl = {0579.43002},
     language = {en},
     url = {https://www.numdam.org/item/CM_1985__54_1_41_0/}
}
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Dzinotyiweyi, Heneri A. M. The cardinality of the set of invariant means on a locally compact topological semigroup. Compositio Mathematica, Tome 54 (1985) no. 1, pp. 41-49. https://www.numdam.org/item/CM_1985__54_1_41_0/

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