The General Similarity Solution of the Heat Equation George BlumanJ. Cole Indiana University Mathematics Journal 1969 text pdf 10.1512/iumj.1969.18.18074 10.1512/iumj.1969.18.18074 en Indiana Univ. Math. J. 18 (1969) 1025 - 1042 state-of-the-art mathematics http://iumj.org/access/