The following publications are possibly variants of this publication:
- Water Vapor Column Measurements With Infrared Active Optical IPDA LidarUpendra N. Singh, Syed Ismail, Tamer F. Refaat, Mulugeta Petros. igarss 2018: 1857-1860 [doi]
- High-Precision and High-Accuracy Column Dry-Air Mixing Ratio Measurement of Carbon Dioxide Using Pulsed 2- $\mu$ m IPDA LidarTamer F. Refaat, Mulugeta Petros, Upendra N. Singh, Charles W. Antill, Ruben G. Remus. tgrs, 58(8):5804-5819, 2020. [doi]
- Triple-pulse integrated path differential absorption lidar for carbon dioxide measurement - Novel lidar technologies and techniques with path to spaceUpendra N. Singh, Tamer F. Refaat, Mulugeta Petros. igarss 2017: 4212-4215 [doi]
- Evaluation of 2-μm Pulsed Integrated Path Differential Absorption Lidar for Carbon Dioxide Measurement - Technology Developments, Measurements, and Path to SpaceUpendra N. Singh, Tamer F. Refaat, Mulugeta Petros, Syed Ismail. staeors, 11(6):2059-2067, 2018. [doi]