Article

Besold, T. R. & Robere, R. (2013). When almost is not even close: Remarks on the approximability of HDTP. Lecture Notes in Computer Science, 7999, pp. 11-20. doi: 10.1007/978-3-642-39521-5_2

Besold, T. R. & Robere, R. (2013). A note on tractability and artificial intelligence. Lecture Notes in Computer Science, 7999, pp. 170-173. doi: 10.1007/978-3-642-39521-5_18