Jesse Hughes Lambèr M. M. Royakkers Don't Ever Do That! Long-term Duties in <i>PD</i> <sub> <i>e</i> </sub> <i>L</i>. 59-79 2008 89 Studia Logica 1 http://dx.doi.org/10.1007/s11225-008-9118-5 db/journals/sLogica/sLogica89.html#HughesR08