Sandra Gutiérrez Sven Oliver Krumke Nicole Megow Tjark Vredeveld How to whack moles. 329-341 2006 361 Theor. Comput. Sci. 2-3 http://dx.doi.org/10.1016/j.tcs.2006.05.017 db/journals/tcs/tcs361.html#GutierrezKMV06