 Nature, 1999 . Despite numerous attempts , there is currently no conclusive analytical evidence that L\'evy flights are preferable strategies in higher dimensions than one.
<clarity>  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 . However, despite extensive research , there is currently no conclusive analytical evidence that L\'evy flights are preferable strategies in higher dimensions than one.