Meeks, JC; EL Campbell; ML Summers; FC Wong (2002). "Cellular differentiation in the cyanobacterium Nostoc punctiforme". Arch Microbiol. 178 (6): 395–403. doi:10.1007/s00203-002-0476-5. PMID12420158. S2CID17609733.
Meeks, JC; EL Campbell; ML Summers; FC Wong (2002). "Cellular differentiation in the cyanobacterium Nostoc punctiforme". Arch Microbiol. 178 (6): 395–403. doi:10.1007/s00203-002-0476-5. PMID12420158. S2CID17609733.
Meeks, JC; EL Campbell; ML Summers; FC Wong (2002). "Cellular differentiation in the cyanobacterium Nostoc punctiforme". Arch Microbiol. 178 (6): 395–403. doi:10.1007/s00203-002-0476-5. PMID12420158. S2CID17609733.