Geodesic
A Kneser Theorem for Higher order Elliptic Equations
Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 1-8

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The problem of establishing oscillation and non-oscillation criteria for elliptic equations has recently been considered by several authors. Extensive bibliographies may be found in the books by C. A. Swanson, [7], and by K. Kreith, [3].Most of the interest has so far centered on equations of second order with some results also established for fourth order equations. Non-oscillation theorems for higher order equations have recently been established by the author, [1], and by Noussair and Yoshida, [5]. In particular, both in [1] and [5], Kneser-type theorems were established for classes of higher order elliptic equations. 
Allegretto, W. A Kneser Theorem for Higher order Elliptic Equations. Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 1-8. doi: 10.4153/CMB-1977-001-6
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     title = {A {Kneser} {Theorem} for {Higher} order {Elliptic} {Equations}},
     journal = {Canadian mathematical bulletin},
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     year = {1977},
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