[1] Bryan R. H.: A linear differential system with general linear boundary conditions. J. Differential Equations, 5 (1969), 38-48. DOI 10.1016/0022-0396(69)90102-8 | MR 0232989 | Zbl 0185.16201

[2] Cole R. H.: General boundary conditions for an ordinary linear differential system. Trans. Amer. Math. Soc.,111 (1964), 521-550. DOI 10.1090/S0002-9947-1964-0159979-0 | MR 0159979 | Zbl 0151.11101

[3] Krall A. M.: The development of general differential and general differential-boundary systems. Rocky Mountain J. Math., 5 (1975), 493-542. DOI 10.1216/RMJ-1975-5-4-493 | MR 0409946 | Zbl 0322.34009

[4] Kurzweil J.: Generalized ordinary differential equations and continuous dependence on a parameter. Czechoslovak Math. J., 7 (82) (1957), 418-449. MR 0111875 | Zbl 0090.30002

[5] Kurzweil J.: On integration by parts. Czechoslovak Math. J. 8 (83) (1958), 356-359. MR 0111877 | Zbl 0094.03505

[6] Schwabik Š.: On an integral operator in the space of functions with bounded variation. Časopis pěst. mat., 97 (1972), 297-330. MR 0450906 | Zbl 0255.47057

[7] Schwabik Š., Tvrdý M., Vejvoda O.: Differential and integral equations: Boundary value problems and adjoints. Academia, Praha& Reidel, Dordrecht, 1979. MR 0542283

[8] Tvrdý M.: Boundary value problems for linear generalized differential equations and their adjoints. Czechoslovak Math. J., 23 (98) (1973), 183-197. MR 0320417

[9] Tvrdý M.: Boundary value problems for generalized linear integrodifferential equations with left-continuous solutions. Časopis pěst. mat. 99 (1974), 147-157. MR 0405041

[10] Tvrdý M.: Fredholm-Stieltjes integral equations with linear constraints. Duality theory, and Green's Function. Časopis pěst. mat., 104(1919), to appear. MR 0553170

[11] Vejvoda O., Tvrdý M.: Existence of solutions to a linear integro-differential equation with additional conditions. Ann. Mat. Purа Appl. 89 (1971), 169-216. DOI 10.1007/BF02414947 | MR 0316988