@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/}
}