1. 1.  Park Chang Gun, Lee Han Seung, Mohamed Ismail and Choi Hu Kuk, Study on the hydration heat of mass orete ied with urea feaalsis,Journal of Asian Concrete Federation, September 2014.
   2. S Chandra, " Durability problems in concrete," 25th Conference on Our world in concrete & structures, 23 - 24 august 2000, singapore.
   3.  Abdul rasoul Salih Mahdi, " Urea fertilizer as corrosion inhibitor for reinforced steel in simulated chloride contaminated concrete pore solution," International Journal of Advanced Research in Education & Technology (IJARET), Volume 5, Issue 5, May (2014), pp. 30-39.
   4. Choi W., Kim H., Choi B., Lee Y., & Jung S., 'A Study on Properties of Crack Reducing Concrete Containing Urea', Architectural Institute of Korea, 29(1), 2013, 75-82.
   5.  T. Kawai., K. Sakata., 'A Study on the Properties of Concrete Containing Urea', â“’ 2009 Taylor & Francis Group, London, U.K.
   6. Shaaban M., Toshiki A., & Kenji S., 'Influence of Urea in Corete’, Ceet ad Corete Researh, 75, 997, 733745
   7. Ha-Won Sog, Velu Saraswath 7, CorrosioMonitoring of Reinforced Concrete Structures – A Review, Int. J. Electrochem , Sci., 2,1- 28.