@article{EJDE_1998__1998__a7,
     author = {Chyan,  Chuan Jen and Davis,  John M. and Henderson,  Johnny and Yin,  William K.C.},
     title = {Eigenvalue comparisons for differential equations on a measure chain},
     journal = {Electronic journal of differential equations},
     year = {1998},
     volume = {1998},
     zbl = {0912.34067},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1998__1998__a7/}
}