I have stumbled upon a paper that is very related to my field of research and after reading and discussing it with my supervisor, I found some issues in the paper that I need more information about, such as the data set they used.
When I sent them an email (their emails are university email accounts) I received a failure notice telling me that these emails have been discontinued.
What is the protocol that I should follow to pass my inquires to them?
I have found one of the author's LinkedIn account, from it I know his current working place, can I contact the company asking them for his contact information? And I have already sent him a connection request containing a brief message of my intentions.