What do you mean by full text search over their contents? I just found a full published article? Do you mean that there's a competing article on libgen? If so,

What do you mean by full text search over their contents? I just found a full published article? Do you mean that there's a competing article on libgen? If so, that's fairly normal with science, it changes year to year or month to month, those articles can both be valid in some sense because they are time dependent.