“ Earth-Space-Path Zenith Rain Attenuation Estimation Upto 50 GHz by Ground-Based Passive Microwave Radiometers Operating over New Delhi”. Journal of International Academy of Physical Sciences, vol. 1, no. 1-2, May 1997, pp. 83-88, http://www.iaps.org.in/journal/index.php/journaliaps/article/view/676.