@article{MAN_1991__289_4_164784,
     author = {Peter Pflug and Marek Jarnicki},
     title = {The inner {Carath\'edory} distance for the annulus.},
     journal = {Mathematische Annalen},
     pages = {335--340},
     publisher = {mathdoc},
     volume = {289},
     number = {4},
     year = {1991},
     zbl = {0719.30036},
     url = {http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164784/}
}