[1] F. V. Atkinson: Discrete and Continuous Boundary Value Problems. Academic Pгess, New Yoгk, 1964. MR 0176141

[2] W. F. Denny: A Linear Riemann-Stieltjes Integral Equation System. Journal of Diff. Equations 22 (1976), 1-13. MR 0425546 | Zbl 0328.34029

[3] W. F. Denny: Oscillation Criteria for a Linear Riemann-Stieltjes Integral Equation System. Journal of Diff. Equations 22 (1976), 14-27. MR 0425547 | Zbl 0328.34029

[4] K. Kгeith: Sturm-Liouville Oscillations in the Presence of Strong Impulses. to appear.

[5] A. B. Mingaгelli: Volterra-Stieltjes Integral Equations and Generalized Ordinaгy Differential Expressions. Lectuгe Notes in Math. 989, Springeг-Verlag, Berlin, Heidelberg, New Yoгk, Tokio, 1983. MR 0706255

[6] W. T. Reid: Sturmian Theory for Ordinary Differential Equations. Appl. Math. Sciences, Vol. 31, Springeг-Veгlag, New York, Heidelbeгg, Beгlin, 1980. MR 0606199 | Zbl 0459.34001

[7] Š. Schwabik M. Tvгdý O. Vejvoda: Differential and Integral Equations. Boundary Value Problems and Adjoints. Academia, Pгaha, Reidel, Doгdгecht, 1979. MR 0542283