@book{etudes+des+forces+hydrauliques+du+bas+congo+1910+1911,
    author = {Thys, Robert Elie Gustave},
    title = {Études des forces hydrauliques du Bas-Congo : 1910-1911},
    address = {Bruxelles},
    publisher = {Imprimerie Scientifique Charles Bulens},
    date = {1912}
}