Authors: Richards, PDG Deeming, DC

Citation: Pdg. Richards et Dc. Deeming, Correlation between shell colour and ultrastructure in pheasant eggs, BR POULT SC, 42(3), 2001, pp. 338-343

Authors: Richards, PDG Richards, PA Lee, ME

Citation: Pdg. Richards et al., Ultrastructural characteristics of ostrich eggshell: outer shell membrane and the calcified layers, J SA VET AS, 71(2), 2000, pp. 97-102

Authors: Richards, PA Richards, PDG Tiltman, AJ

Citation: Pa. Richards et al., The ultrastructure of fibromyomatous myometrium and its relationship to infertility, HUM REP UPD, 4(5), 1998, pp. 520-525