Syrett PJ & Al-Houty FAA (1984) The phylogenetic significance of the occurrence of urease / urea amidolyase and glycollate oxidase / glycollate dehydrogenase in green algae. British Phycological Journal 19(1): 11-21. DOI: 10.1080/00071618400650021
Al-Houty FAA & Syrett PJ (1984) The occurrence of urease / ruea amidolyase and glycollate oxidase / dehydrogenase in Klebsormidium spp. and members of the Ulotrichales. British Phycological Journal 19(1): 1-10. DOI: 10.1080/00071618400650011