TY  - JOUR
AU  - Beddani Hamid
TI  - Upper-solution or lower-solution method for Langevin equations with n fractional orders
JO  - Filomat
PY  - 2021
SP  - 4743 
VL  - 35
IS  - 14
UR  - http://geodesic.mathdoc.fr/articles/10.2298/FIL2114743H/
DO  - 10.2298/FIL2114743H
LA  - en
ID  - 10_2298_FIL2114743H
ER  -