 Ahlfors wrote several other significant books, including "Riemann surfaces" (1960) and "Conformal invariants" (1973).He made decisive contributions to meromorphic curves, value distribution theory, Riemann surfaces, conformal geometry, quasiconformal mappings and other areas during his career.In 1933, he married Erna Lehnert, an Austrian who with her parents had first settled in Sweden and then in Finland.