  The z-zeros of the modified Bessel function of the third kind K_{nu}(z), also
known as modified Hankel function or Macdonald function, are considered for
arbitrary complex values of the order nu. Approximate expressions for the
zeros, applicable in the cases of very small or very large |nu|, are given. The
behaviour of the zeros for varying |nu| or arg(nu), obtained numerically, is
illustrated by means of some graphics.
