Joan Keen

发表

H. O. Hartley, Joan Keen, J. Arthur Greenwood, 1962 .

Joan Keen, R. Wilkinson, Alan Huitson, 1965 .

Joan Keen, D. B. Manwaring, Alan Huitson, 1965 .

Joan Keen, K. W. Kemp, Alan Huitson, 1966 .