@article{MS2_1975__36_166411,
     author = {Albert Marden and Howard Masur},
     title = {A foliation of {Teichm\"uller} space by twist invariant disks.},
     journal = {Mathematica Scandinavica},
     pages = {212--229},
     year = {1975},
     volume = {36},
     zbl = {0318.32019},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__36_166411/}
}