A Result About Languages Concerning Paperfolding Sequences. - Siegfried Lehr (Math. Syst. Theory, 1992)

Sums and Rational Multiples of q-Automatic Sequences are q-Automatic. - Siegfried Lehr (Theor. Comput. Sci., 1993)

Sprachoperatoren und arithmetische Eigenschaften unendlicher Symbolfolgen. - Siegfried Lehr (1994)

On the Vector Space of the Automatic Reals. - Siegfried Lehr; Jeffrey O. Shallit; John Tromp (Theor. Comput. Sci., 1996)