no. 1-2
Monogenic groups
Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 155-161. 
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     author = {Rajagopalan, M. and Rotman, J. J.},
     title = {Monogenic groups},
     journal = {Compositio Mathematica},
     pages = {155--161},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     year = {1967},
     mrnumber = {220831},
     zbl = {0241.22012},
     language = {en},
     url = {http://www.numdam.org/item/CM_1967__18_1-2_155_0/}
}
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Rajagopalan, M.; Rotman, J. J. Monogenic groups. Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 155-161. http://www.numdam.org/item/CM_1967__18_1-2_155_0/

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L.A. Rubel, [4] Uniform distribution on locally compact groups, Comm. Math. Helv. (to appear). | MR | Zbl

W. Rudin, [5] Fourier analysis on groups, Interscience, (Now John Wiley) (1960) New York. | MR | Zbl