@article{10_4064_ap_30_3_225_228,
     author = {Zdzis{\l}aw Frydrych},
     title = {On certain oscillatory properties for solutions of an equation with a biharmonic leading part},
     journal = {Annales Polonici Mathematici},
     pages = {225--228},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1974},
     doi = {10.4064/ap-30-3-225-228},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-3-225-228/}
}