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Помогите, пожалуйста, со статьями:

1.The action of acid chlorides on 4-chloro- and 4-hydroxypyridine -n-oxide and some of their derivatives
H. J. den Hertog, J. Maas, C. R. Kolder, W. P. Combé
Recueil des Travaux Chimiques des Pays-Bas
Volume 74, Issue 1, pages 59–68, 1955

DOI:

http://dx.doi.org/10.1002/recl.19550740108

2.Investigations on pyridine and quinoline derivatives: (42nd. Communication) The formation of (4-pyridyl)-pyridinium compounds from
4-chloropyridine and 4-bromopyridine J. P. Wibaut, F. W. Broekman
Recueil des Travaux Chimiques des Pays-Bas
Volume 58, Issue 10, pages 885–894, 1939

DOI:

http://dx.doi.org/10.1002/recl.19390581006

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