@article{MAN_1921__82_158838,
     author = {E. Trefftz},
     title = {\"Uber die {Torsion} prismatischer {St\"abe} von polygonalem {Querschnitt}},
     journal = {Mathematische Annalen},
     pages = {97--112},
     publisher = {mathdoc},
     volume = {82},
     year = {1921},
     zbl = {47.0737.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__82_158838/}
}