I did not know academia.edu before this PR, it seems like you need to be logged in to access the link you used though: https://www.academia.edu/download/53866475/83.85543220170715-8581-fehoxf.pdf

I am wondering whether we should use the official link even if it is behind a paywall: https://ieeexplore.ieee.org/document/855432.

I think that we can use the doi instead. I will make a proposal to change the line of code.

I have made changes as suggested by @glemaitre

@glemaitre @aman1971 There is a pdf of the paper in the author's google scholar site which is accessible, please check whether it can be used

https://scholar.google.com/citations?view_op=view_citation&hl=en&user=84bC7xgAAAAJ&citation_for_view=84bC7xgAAAAJ:u-x6o8ySG0sC

@kanissh The PDF is from academia as stated by @lesteve

The problem is the source of the pdf? I get it.

The DOI renders fine now, merging this one.

FWIW seems like academic.edu on the Google Scholar page creates a temporary valid (notes the Expires= in th URL) link like:
https://d1wqtxts1xzle7.cloudfront.net/53866475/83.85543220170715-8581-fehoxf-with-cover-page-v2.pdf?Expires=1655817712&Signature=EmuQtNx4hfSvC7pHjrWYehUPxa5ALElZgtKiNxGdzoQO7pvZewyvUgOJedPemNaPxoeH36xK-50YlzzT-822ZwDWAgm7fovI3yElCnWYiiJmwpY25S5XiRCYT8SUYicTGbli2gO2bbxbRpCdIRvAA2HoatNb27HFr1tDzRnB70PPejpIM-fCxIhYAFh~HN~i8Iek53XISto4tYaZIwSYhWtsypOvCiKKYdDB9~OE6YBrlT9wq0xZUPGCN9SLSOINoexjyLngMSn9mapz7RnoynQFRPRilLIDQ8qJGjl0yFKUFwkqcIdUeL4sj88lbHksrfBhP-rIfQuXWHnyTuYfmg__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA

so this is not really usable as a stable link.