Pan, J.-Z. & Shaw, C. & Halton, D.W. & Thim, L. & Johnston, C.F. & Buchanan, K.D. (1992)
The primary structure of peptide Y (PY) of the spiny dogfish, Squalus acanthias: immunocytochemical localisation and isolation from the pancreas. Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 102(1), 1–5
DOI: 10.1016/0305-0491(92)90262-P

Pan, J.-Z. & Shaw, C. & Halton, D.W. & Thim, L. & Johnston, C.F. & Fairweather, I. & Buchanan, K.D. (1991)
Isolation and primary structure of peptide Y from the pancreas of the spiny dogfish, Squalus acanthias [Abstract]. Regulatory Peptides, 35(3), 252
DOI: 10.1016/0167-0115(91)90144-6

Halton, D.W. & Stranock, S.D. (1976)
The fine structure and histochemistry of the caecal epithelium of Calicotyle kröyeri (Monogenea: Monopisthocotylea). International Journal for Parasitology, 6(3), 253–263
DOI: 10.1016/0020-7519(76)90043-6