@book{contribution+a+l+039+etude+des+ponts+a+bequilles,
    author = {Descans, Léon},
    title = {Contribution a l'étude des ponts a béquilles},
    address = {Paris i Bruxelles},
    publisher = {Dunod et Pinat, Libraires, éditeurs ; i Goemaere},
    date = {1911}
}