Invariant submanifolds of codimension 2 of almost contact manifolds
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 3, pp. 377-388. 
@article{ASNSP_1971_3_25_3_377_0,
     author = {Goldberg, Samuel I.},
     title = {Invariant submanifolds of codimension $2$ of almost contact manifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {377--388},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 25},
     number = {3},
     year = {1971},
     mrnumber = {305300},
     zbl = {0221.53029},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1971_3_25_3_377_0/}
}
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Goldberg, Samuel I. Invariant submanifolds of codimension $2$ of almost contact manifolds. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 3, pp. 377-388. http://www.numdam.org/item/ASNSP_1971_3_25_3_377_0/

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