"Effects of bromide and iodide on stalk secretion in the biofouling dia" by Kyle D. Hoagland, Lisa M. Johnson et al.
Johnson, L.M., Hoagland, K.D. 1995. Effects of bromide and iodide on stalk secretion in the biofouling diatom Achnanthes longipes (Bacillariophyceae). J. Phycol. 31, 401-412.