D Yeomans, M Taylor, A Currie, R Whale, K Ford, C Fear, J Hynes, G Sullivan, B Moore and T. Burns
Advances in Psychiatric Treatment 16 ( 2 ): 86 - 95 , 2010
E Alkan, K Ford and A. Zaharescu
Bulletin London Mathematical Society 41 ( 4 ): 676 - 682 , 2009