@article{PMF_1934_41_1_a5,
     author = {Ridder, J.},
     title = {Das {Riemann-Stieltjessche} {Integral}},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {65--95},
     year = {1934},
     volume = {41},
     number = {1},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/PMF_1934_41_1_a5/}
}