no. 4
Invariant means on vector valued functions I
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 27 (1973) no. 4, pp. 717-727. 
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     author = {Husain, T. and Wong, James C. S.},
     title = {Invariant means on vector valued functions {I}},
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Husain, T.; Wong, James C. S. Invariant means on vector valued functions I. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 27 (1973) no. 4, pp. 717-727. http://archive.numdam.org/item/ASNSP_1973_3_27_4_717_0/

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