Elwan, O., A. A. Helmy, M. E. Tamawy, M. A. Naseer, I. E. Banhawy, A. A. Kader, and F. Elwan,  "Ergoloids and ischaemic strokes; efficacy and mechanism of action.",  The Journal of international medical research, vol. 23, issue 3, pp. 154-66, 1995 May-Jun.