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Oblath, Richard, Eine Bemerkung über Produkte aufeinander folgender Zahlen. J. Indian Math. Soc. (N.S.) (1951), 135-139. The site's commentary credits the case $(k,\ell)=(5,2)$ to Obláth under this key, which the site's reference record resolves to this 1951 note; Győry, Hajdu and Saradha (2004, reference [11]) and Bennett, Bruin, Győry and Hajdu (2006, references [26] and [27]) place that case in Obláth's earlier paper, Über das Produkt fünf aufeinander folgender Zahlen in einer arithmetischen Reihe, Publ. Math. Debrecen 1 (1950), 222-226, doi:10.5486/PMD.1950.1.2-4.29, the paper the commentary describes.