1. Disconjugacy;Coppel,1971
2. A classification of the solutions of a differential equation according to their asymptotic behavior;Elias,1979
3. Oscillatory solutions and extremal points for linear differential equations;Elias;Arch. Rational Mech. Anal.,1979
4. Minors of the wronskian of the differential equation Lny + p(x)y = 0;Elias,1987
5. U. Elias, Minors of the wronskian of the differential equation Lny + p(x)y = 0 II; Dominance of solutions, Proc. Roy. Soc. Edinburgh Sect. A, in press.