Giovanni Criscuolo Fausto Giunchiglia Luciano Serafini A Foundation for Metareasoning Part I: The Proof Theory. 167-208 2002 12 J. Log. Comput. 1 http://www3.oup.co.uk/logcom/hdb/Volume_12/Issue_01/120167.sgm.abs.html db/journals/logcom/logcom12.html#CriscuoloGS02