@article{10_2298_FIL2115181A,
     author = {Hamed Aslani and Davod Khojasteh Salkuyeh and Fatemeh Panjeh Ali Beik},
     title = {On the preconditioning of three-by-three block saddle point problems},
     journal = {Filomat},
     pages = {5181 },
     year = {2021},
     volume = {35},
     number = {15},
     doi = {10.2298/FIL2115181A},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/FIL2115181A/}
}