1. Ammonia annual production capacity globally 2030 , https://www.statista.com/statistics/1065865/ammonia-production-capacity-globally/ , (accessed July 6, 2021 )
2. Ammonia Market Size Worth $76.64 Billion By 2025 | CAGR 5.3% , https://www.grandviewresearch.com/press-release/global-ammonia-market , (accessed July 6, 2021 )
3. Review of electrochemical ammonia production technologies and materials
4. 50 year trends in nitrogen use efficiency of world cropping systems: the relationship between yield and nitrogen input to cropland
5. Ammonia Market Size Worth $76.64 Billion By 2025 | CAGR 5.3% , https://www.grandviewresearch.com/press-release/global-ammonia-market , (accessed July 7, 2021 )