Characterizing Blowup Using Similarity Variables Yoshikazu GigaRobert Kohn Indiana University Mathematics Journal 1987 text pdf 10.1512/iumj.1987.36.36001 10.1512/iumj.1987.36.36001 en Indiana Univ. Math. J. 36 (1987) 1 - 40 state-of-the-art mathematics http://iumj.org/access/