  We present a survey on recent results about Stirling's formula. More exactly,
we reffer to a method using a form of Cesaro-Stolz lemma firstly introduced in
[C. Mortici Product approximations via asymptotic integration Amer. Math.
Monthly 117 (5) (2010) 434-441]. As an example we improve a result obtained in
[C. Mortici A substantial improvement of the Stirling formula Appl. Math. Lett.
24 (2011) no. 8 1351-1354]. Finally, some numerical computations are made.
