1. 1. WWAP, WWAP (United Nations World Water Assessment Programme). 2017.
   2. X. Leflaive, M. Witmer, R. Martin-Hurtado, M. Bakker, T. Kram, L. Bouwman, H. Visser, A. Bouwman, H. Helderink, and K. Kim, “OECD Environmental Outlook to 2050,” 2012.
   3. K. Kalidasa Murugavel, K. K. S. K. Chockalingam, and K. Srithar, “An experimental study on single basin double slope simulation solar still with thin layer of water in the basin,” Desalination, vol. 220, pp. 687–693, 2008.
   4. V. K. Dwivedi and G. N. Tiwari, “Comparison of internal heat transfer coefficients in passive solar stills by different thermal models: An experimental validation,” Desalination, vol. 246, no. 1–3, pp. 304–318, Sep. 2009.
   5. S. Vaithilingam and G. S. Esakkimuthu, “Energy and exergy analysis of single slope passive solar still: an experimental investigation,” Desalin. Water Treat., vol. 55, no. 6, pp. 1433–1444, Jun. 2014.
   6.  N. Rahbar and J. A. Esfahani, “Productivity estimation of a single-slope solar still: Theoretical and numerical analysis,” Energy, vol. 49, no. 1, pp. 289–297, Jan. 2013.
   7.  A. K. Tiwari and G. N. Tiwari, “Evaluating the performance of single slope passive solar still for different slope of cover and water depths by thermal modeling: In moderate climatic condition,” in International Solar Energy Conference, 2006, vol. 2006.
   8.  V. R. Khare, A. P. Singh, H. Kumar, and R. Khatri, “Modelling and Performance Enhancement of Single Slope Solar Still Using CFD,” Energy Procedia, vol. 109, no. November 2016, pp. 447–455, 2017
   9. A. Madhlopa and C. Johnstone, “Model for computation of solar fraction in a single-slope solar still,” Sol. Energy, vol. 83, no. 6, pp. 873–882, 2009
   10. D. R. Mishra, A. K. Tiwari, and M. S. Sodha, “Mathematical modeling and evaluation of new long single slope still for utilization of hot waste water,” Appl. Therm. Eng., vol. 108, pp. 353–357, 2016.