1. Timmer, B., Olthuis, W., & Van Den Berg, A. (2005). Ammonia sensors and their applications a review. Sensors and Actuators, B: Chemical Sensors and Materials, 107, 666–677.
2. Amin, N., Mohamood, R. T., Asad, M. J., Zafar, M., & Raja, A. M. (2014). Evaluating urea and creatinine levels in chronic renal failure pre and post dialysis: A prospective study. Journal of Cardiovascular Disease, 2, 2.
3. Shamsadini, S., Darvish Moghaddam, S., Abdollahi, H., Fekri, A. R. & Ebrahimi H. A. (2006). Creatinine, blood urea nitrogen and thyroid hormone levels before and after haemodialysis. Eastern Mediterranean Health Journal, 12, 231–235.
4. Kumar, Gaurav, Mishra, Sunita, & Jain, Aastha. (2013). Development of breath ammonia analysis system for disease diagnosis. Asian Journal of Biochemical and pharmaceutical Research, 3, 36–43.
5. Distante, C., Leo, M., Siciliano, P., & Persaud, K. C. (2002). On the study of feature extraction methods for an electronic nose. Sensors and Actuators B Chemical Sensors and Materials, 87, 274–288.