Razzaque, M., M. Haque, Q. Khaliq, and A. Solaiman. “The Effect of Different Nitrogen Levels and Enrichment CO<sub>2</sub> On the Nutrient Contents of Rice Cultivars”. Bangladesh Journal of Scientific and Industrial Research, vol. 44, no. 2, Nov. 2009, pp. 241-6, doi:10.3329/bjsir.v44i2.3680.