@article{NAM_1879_2_18__256_1,
     author = {Mac\'e de L\'epinay},
     title = {Th\'eorie des t\'elescopes {Gr\'egory} et {Cassegrain}},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {256--260},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 18},
     year = {1879},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1879_2_18__256_1/}
}