@article{10_4064_ap_65_3_235_244,
     author = {Irena Rach\r{u}nkov\'a},
     title = {Upper and lower solutions satisfying the inverse inequality},
     journal = {Annales Polonici Mathematici},
     pages = {235--244},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1996},
     doi = {10.4064/ap-65-3-235-244},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-65-3-235-244/}
}