@article{RLINA_1979_8_66_4_a2,
     author = {Chan, C.Y. and Young, Eutiquio C.},
     title = {Comparison theorems for a coupled system of singular hyperbolic differential inequalities. {I.} {Time-independent} uncoupling coefficients},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
     pages = {250--254},
     publisher = {mathdoc},
     volume = {Ser. 8, 66},
     number = {4},
     year = {1979},
     zbl = {0472.35009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLINA_1979_8_66_4_a2/}
}