Almost Automorphic Functions on Topological Groups Riho Terras Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21060 10.1512/iumj.1972.21.21060 en Indiana Univ. Math. J. 21 (1972) 759 - 773 state-of-the-art mathematics http://iumj.org/access/