@article{EJDE_2005__2005__a268,
     author = {Anderson,  Douglas R. and Hoffacker,  Joan},
     title = {Even order self adjoint time scale problems},
     journal = {Electronic journal of differential equations},
     year = {2005},
     volume = {2005},
     zbl = {1075.34010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a268/}
}