Large scale knowledge based systems for airborne decision support. - H. Howells; A. Davies; B. Macauley; R. Zancanato (Knowl. Based Syst., 1999)

Improving short-term conflict alert via tabu search. - John E. Beasley; H. Howells; Julia Sonander (J. Oper. Res. Soc., 2002)