Tande, K.S. & S. Gronvik. (1983). Ecological investigations on the zooplankton community of Balsfjorden, northern Norway: sex ratio and gonad maturation cycle in the copepod Metridia longa (Lubbock). Journal of Experimental Marine Biology and Ecology 71(1):43-54, figs. 1-6, tab. 1. (15-viii-1983)