@article{ASNSP_1972_3_26_1_97_0, author = {Van\v zura, Ji\v r\'\i }, title = {Almost $r$-contact structures}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 26}, number = {1}, year = {1972}, pages = {97-115}, zbl = {0234.53040}, mrnumber = {362132}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1972_3_26_1_97_0} }
Vanžura, Jiří. Almost $r$-contact structures. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 1, pp. 97-115. http://www.numdam.org/item/ASNSP_1972_3_26_1_97_0/
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