@article{MAN_1984__266_163849,
     author = {Tsuyoshi Sakai},
     title = {Polynomials of {Invertibel} {Knots.}},
     journal = {Mathematische Annalen},
     pages = {229--232},
     year = {1984},
     volume = {266},
     zbl = {0507.57004},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__266_163849/}
}