Quantitative unique continuation for a parabolic equation Igor Kukavica Indiana University Mathematics Journal 2018 text pdf 10.1512/iumj.2018.67.7283 10.1512/iumj.2018.67.7283 en Indiana Univ. Math. J. 67 (2018) 657 - 678 state-of-the-art mathematics http://iumj.org/access/