Pawan Kumar Inaniya, Arvind Sharma, Amarjeet Poonia, Manoj Kuri, Indu Bhuria. “Analysis of Birefringence and Losses in Photonic Crystal Fibre”. Design Engineering, Nov. 2021, pp. 13020 -25, http://thedesignengineering.com/index.php/DE/article/view/6419.