%0 Journal Article
%A Beddani Hamid
%T Upper-solution or lower-solution method for Langevin equations with n fractional orders
%J Filomat
%D 2021
%P 4743 
%V 35
%N 14
%U http://geodesic.mathdoc.fr/articles/10.2298/FIL2114743H/
%R 10.2298/FIL2114743H
%G en
%F 10_2298_FIL2114743H