Minimax Rational Approximation

I'm looking for Matlab code to approximate F(x)=a(x)./b(x) in the
minimum absolute error sense.

I used to have a copy of Hart et al, "Computer Approximations", which
I remember had a good working procedure for this, but it's out of
print and I can't find my copy.

Recently, the function Ratpolyfit was posted on the file exchange
that solve this problem in the least squares sense, but I really need
to work the problem for minimum error.
.