Dimensions of overlaps of self-similar fractals and self-similar multifractals Lars Olsen 28A80fractalsmutilifractalsHausdorf measurepacking measurebox dimension$L^q$ spectrum Indiana University Mathematics Journal 2002 text pdf 10.1512/iumj.2002.51.2186 10.1512/iumj.2002.51.2186 en Indiana Univ. Math. J. 51 (2002) 1461 - 1478 state-of-the-art mathematics http://iumj.org/access/