 Nature, 1999 . Despite numerous attempts , there is currently no conclusive analytical evidence that L\'evy flights are preferable strategies in higher dimensions than one.
<meaning-changed>  Nature, 1999 . Despite numerous attempts , there is currently no conclusive analytical evidence that L\'evy flights are preferable strategies in higher dimensions than one.
 Nature, 1999 . Despite numerous attempts , there is currently no conclusive analytical evidence that L\'evy walks are, in any manner, preferable strategies in higher dimensions than one.