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P. J.  Hayward, ?Preliminary observations on settlement growth in populations of Alcyonidium hirsutum (Fleming).?, in Living and Fossil Bryozoa, London: Academic Press, 1973, pp. 107-113.

D. W.  Wyer and King, P. E., ?Relationships between some British littoral and sublittoral bryozoans and pycnogonids.?, Living and fossil Bryozoa. Academic Press, London and New York, pp. 199-207, 1973.