[1] BAILEY P. B., SHAMPINE L. F., WALTMAN P. E.: Nonlinear Two-point Boundary Value Problems. Acad. Press., New York, 1968. MR 0230967 | Zbl 0169.10502

[2] CONTI R.: Recent trends in the theory of boundary value problems for ordinary differential equations. Boll. Unione Mat. Ital., 1967, 22, 3, 135-178. MR 0218650 | Zbl 0154.09101

[3] GREGUŠ M., ŠVEC M., ŠEDA V.: Ordinary Differential Equations. (Slovak). Alfa, Bratislava, 1985, 374 p.

[4] HARTMAN P.: Ordinary Differential Equations. (Russian). Mir, Moscow, 1970. 720 p. MR 0352574 | Zbl 0214.09101

[5] KIGURADZE I. T.: On the Theory of Nonlinear Two-point Boundary Problems. (Russian). Summer school on ordinary diff. eq. Difford 74, Czechoslovakia, 1974.

[6] KIGURADZE I. T.: Some Singular Boundary Value Problems for Ordinary Differential Equations. (Russian). Tbilisi Univ. Press., 1975. MR 0499402

[7] KIGURADZE I. T., LOMTATIDZE A. G.: On certian boundary value problems for second-order linear ordinary differential equations with singularities. J. Math. Anal. Appl. 101, 1984, 325-347. MR 0748576

[8] LOMTATIDZE A. G.: On certain singular three-point boundary value problem. (Russian). Trudy IPM Tbilisi 17, 1986, 122-134. MR 0853277

[9] RACHŮNKOVÁ I.: A four point problem for differential equations of the second order. Arch. math. (Brno), to appear. MR 1188062 | Zbl 0715.34033

[10] RACHŮNKOVÁ I.: Existence and uniqueness of solutions of four-point boundary value problems for 2nd order differential equations. preprint. MR 1018005 | Zbl 0695.34016

[11] RACHŮNKOVÁ I.: On a certain four-point problem. preprint. Zbl 0957.34018

[12] RACHŮNKOVÁ I.: The first kind periodic solutions of differential equations of the second order. Math. Slovaca, 39, 1989. MR 1094763 | Zbl 0753.34028

[13] ŠEDA V.: A lecture at the Winter school on diff. eq. in: Vrátna dolina, Czechoslovakia, January 1988.