@article{BSMA_1879_2_3_1_26_1,
     author = {Hansted, Birger},
     title = {Deux pi\`eces peu connues de la correspondance {d'Euler} (lettre {d'Erik} {Pontoppidan} \`a {L.} {Euler,} et r\'eponse {d'Euler)}},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     pages = {26--32},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 3},
     number = {1},
     year = {1879},
     language = {fr},
     url = {http://archive.numdam.org/item/BSMA_1879_2_3_1_26_1/}
}