Disconjugacy characterization by means of spectral (k, n-k) problems. - Alberto Cabada; Lorena Saavedra (Appl. Math. Lett., 2016)

Characterization of non-disconjugacy for a one parameter family of nth-order linear differential equations. - Alberto Cabada; Lorena Saavedra (Appl. Math. Lett., 2017)