1. A selfadjoint "Simultaneous Crossing of the Axis," Proceedings of the Georgian Academy of Sciences (1993), 1: 197-206.

Can one manipulate the ends of a vibrating string so as to obtain a "simultaneous crossing of the axis? Yes, if you are willing to shorten the string at the same time.

2. Estabilshing Hyperbolic Green's Functions via Leibniz's Rule, SIAM Review (1991), 33: 101-105.

Selfadjoint boundary value problems corresponding to hyperbolic PDEs? Surely you are joking Mr. Kreith.

3. Sturm-Liouville Oscillations in the Presence of Strong Impulses, Colloquia Societatis Janos Bolyai (1986), 47: 573-589.

An extension of a Sturmian comparison theorem to generalized solutions that may be discontinuous.

4. Lower Estimates for Zeros of Stochastic Sturm-Liouville Problems, Proceedings of the American Mathematical Society (1984), 92: 515-518.

Zeros of solutions of a stochastic S-L equation are random variables. Interesting relationships exist between their expected values and the zeros of a related deterministic S-L equation.

5. PDE Generalizations of the Sturm Comparison Theorem, Memoirs of the American Mathematical Society (1984), 48: 31-46.

A digression into historical aspects of Sturmian theory and its relation to the calculus of variations.