Slash mark in some articles

Hi; When using articles with volumes but no issues, a slash appears in both the footnotes and the bibliography. How can we remove this? You can find examples below.

Footnote: Baki Tezcan, “Hanafism and the Turks in al-Ṭarasūsī’s Gift for the Turks (1352)”, Mamluk Studies Review 15/ (2011), 78-84.

Bibliography: Tezcan, Baki. “Hanafism and the Turks in al-Ṭarasūsī’s Gift for the Turks (1352)”. Mamluk Studies Review 15/ (2011), 67-86.
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