The authors study the system , on , , and , subject to the interval and boundary conditions on , , to investigate the oscillatory behavior of the solutions. This investigation examines the effects of the nonzero shifts on oscillatory behavior and construct leading-order oscillatory solutions using a WKB method. This is their sixth paper on the subject.
[For part V, see ibid. 249-272 (1994; Zbl 0796.34049, see the preceding review)].