@article{BSMF_1887__15__198_1,
     author = {Laisant, C.- A.},
     title = {Th\'eor\`emes de trigonom\'etrie},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {198--202},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {15},
     year = {1887},
     doi = {10.24033/bsmf.356},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.356/}
}