@article{700459,
     title = {Oscillation criteria for half-linear partial differential equations via Picone's identity},
     booktitle = {Proceedings of Equadiff 11},
     series = {GDML\_Books},
     publisher = {Comenius University Press},
     address = {Bratislava},
     year = {2007},
     pages = {589-598},
     url = {http://dml.mathdoc.fr/item/700459}
}

Yoshida, Norio. Oscillation criteria for half-linear partial differential equations via Picone's identity, dans Proceedings of Equadiff 11, GDML_Books,  (2007), pp. 589-598. http://gdmltest.u-ga.fr/item/700459/