by Nash, T., Evered, D. F., Cipera, J. D., Dunstone, J. R., Madsen, N. P., Bell, Helen R., Dickinson, D., Raven, T. W., Montgomery, H. A. C., Wroński, Mieczysław, Antoszewski, R., Knypl, J. S., Tyrrell, H. J. V., Dowson, B. A.
Published in Analyst (London) (1960)