@article{MAN_1985__271_163975,
     author = {Walter D. Neumann and Mark Jankins},
     title = {Rotation {Numbers} of {Products} of {Circle} {Homeomorphisms.}},
     journal = {Mathematische Annalen},
     pages = {381--400},
     year = {1985},
     volume = {271},
     zbl = {0543.57019},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__271_163975/}
}