On recurrent spaces of first order
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 4, p. 889-909 
@article{ASNSP_1972_3_26_4_889_0,
     author = {Garai, Ranjan Kumar},
     title = {On recurrent spaces of first order},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
     number = {4},
     year = {1972},
     pages = {889-909},
     zbl = {0246.53044},
     mrnumber = {362103},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1972_3_26_4_889_0}
}

Garai, Ranjan Kumar. On recurrent spaces of first order. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 4, pp. 889-909. http://www.numdam.org/item/ASNSP_1972_3_26_4_889_0/

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