Our book has been republished by SIAM (Society of Industial and Applied Mathematics). Look for it in SIAM's catalog or your favorite bookstore (i.e. Amazon). The electronic copy available here is exactly the same as the original book. SIAM has been very gracious about letting us keep the electronic copy online. But if you are going to read more than a few pages we encourage you to buy the book from SIAM. It's not that expensive!!!