R. Freund, L. Staiger et al.:
"Going Beyond Turing with P Automata: Partial Adult Halting and Regular Ovserver Languages";
Talk: UCNC 2015, Auckland; 2015-08-30 - 2015-09-03; in: "Unconventional Computation and Natural Computation", C. Calude et al. (ed.); LNCS/Springer, 9252 (2015), ISBN: 978-3-319-21818-2; 169 - 181.