@misc{10_4153_CMB_1992_009_9,
     title = {Weighted {Averaging} {Techniques} in {Oscillation} {Theory} for {Second} {Order} {Difference} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {61--69},
     year = {1992},
     volume = {35},
     number = {1},
     doi = {10.4153/CMB-1992-009-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-009-9/}
}