@article{MS2_1976__39_166497,
     author = {Albert Marden and Howard Masur},
     title = {Addendum to: {A} foliation of {Teichm\"uller} space by twist invariant disks.},
     journal = {Mathematica Scandinavica},
     pages = {232--238},
     publisher = {mathdoc},
     volume = {39},
     year = {1976},
     zbl = {0347.32013},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166497/}
}