Sultana, S., Yeasmin, Z., Ahmed, S., Nur, H., & Samaddar, P. (2016). Characterization and surface activity of soluble sulfonated butanone formaldehyde superplasticizer for cement. Bangladesh Journal of Scientific and Industrial Research, 51(2), 155–158. https://doi.org/10.3329/bjsir.v51i2.28113