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Correct german citation
Line 65:
| first = L. | last = Lovász | authorlink = László Lovász
| contribution = Problem 9
| title = BeitrageBeiträge zur Graphentheorie und deren AnsendungenAnwendungen
| series = VortgetragenVorgetragen auf dem internationalInternationalen ColloquiumKolloquium in Oberhof (DDR)
| year = 1977 | page = 313}}.