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[1] Brown R. С, Tvrdý M.: Generalized boundary value problems with abstract side conditions and their adjoints I. Czech. Math. J. 30 (105) (1980), 7-27. MR 0565904
[2] Coddington E. A., Dijksma A.: Ajoint subspaces in Banach spaces with applications to ordinary differential subspaces. Ann. di Mat. pura ed appl. CXVIII (1978), 1-118. MR 0533601
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