Sparsely totient numbers
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 5 (1996) no. 2, pp. 183-190. 
@article{AFST_1996_6_5_2_183_0,
     author = {Baker, Roger C. and Harman, Glyn},
     title = {Sparsely totient numbers},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {183--190},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 5},
     number = {2},
     year = {1996},
     mrnumber = {1413852},
     zbl = {0871.11060},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1996_6_5_2_183_0/}
}
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Baker, Roger C.; Harman, Glyn. Sparsely totient numbers. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 5 (1996) no. 2, pp. 183-190. http://www.numdam.org/item/AFST_1996_6_5_2_183_0/

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