def METHOD_NAME(self):
    """
    http://www.me.mtu.edu/~mavable/MEEM4405/Plane.pdf
    """
    A = 1.0
    A = 1 / 2 * A
    m = matrix(([y23, 0, y31, 0, y12, 0],
                [0, x32, 0, x13, 0, x21],
                [x32, y23, x13, y31, x21, y21]))