algorithm was found by . A final question of on the possibility of an analogue of Fáry's theorem for linkless graphs appears not to have been answered: when does the existence of a linkless or flat embedding with curved or piecewise linear edges imply the existence of a linkless or flat embedding in which the edges are straight line segments? See also Knots and graphs Notes References . As cited by . . As cited by . . . . . . . . . . . . . . . . . . . . . . . . . Further reading . Topological graph theory Knot theory Graph minor theory