Just put this line into ~/.xinitrc or ~/.zshrc or other file that is executed BEFORE you start CLI:
echo 'will cite' | parallel --citation 1> /dev/null 2> /dev/null &
echo 'will cite' | parallel --citation 1> /dev/null 2> /dev/null &
The nagging notice should just be removed. It's not like I'm ever going to publish a paper anyway.