Logarithms of L^p Translations T.A. Gillespie Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24087 10.1512/iumj.1975.24.24087 en Indiana Univ. Math. J. 24 (1975) 1037 - 1045 state-of-the-art mathematics http://iumj.org/access/