(1)
Fenwick, R. C. P-Delta Effects in Medium Height Moment Resisting Steel Frames under Seismic Loading: Vol. 23, No. 4, Dec. 1990 Pp. 305-321. BNZSEE 1992, 25 (1), 70-72. https://doi.org/10.5459/bnzsee.25.1.70-72.