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Chaffey, N (1984) 'Epidermal structure in the ligules of four species of the genus Poa L. (Poaceae).' Botanical Journal of the Linnean Society, 89 (4). pp. 341-354.
Chaffey, N (1994) 'Structure and function of the membranous grass ligule: a comparative study.' Botanical Journal of the Linnean Society, 116 (1). pp. 53-69.