Columbia subject headings:
Judah, ha-Levi, active 12th century--Versification.
Piyutim--History and criticism.
Harvard subject headings:
Judah, ha-Levi, 12th cent.--Versification.
Piyutim--History and criticism.
Princeton subject headings:
Judah, ha-Levi, 12th cent.--Versification.
Piyutim--History and criticism.