Analysis of information sources in references of the Wikipedia article "404" in Greek language version.
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value (βοήθεια). Publications de la Sorbonne.|url=
value (βοήθεια). 1. Ambroise Bray.|url=
value (βοήθεια). Saint-Pétersbourg: Eggers.|url=
value (βοήθεια). 13. Migne.|url=
value (βοήθεια). 5. Paris: Charles Robustel.