@article{10_4064_ap_72_1_1_14,
     author = {N. Parhi and P. Praharaj},
     title = {Oscillation criteria for second order self-adjoint matrix differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1999},
     doi = {10.4064/ap-72-1-1-14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-72-1-1-14/}
}