Check the profiles of fellow scholars, on sites such as this one and academia. edu. Many have uploaded their own work. Or places as jstor.org, many faculties and libraries have access to it. Or just hit the library shelves....many museums also have their own libraries, though they are not very inclined to share it with non-employees.
So what's the point of Research Gate if it takes so long to get access??? I know JSTOR of course, but that format doesn't have the articles I saw here..
Research Gate is like the StackExchange sites, except here you can get more immediate feedback from peers and others about research and questions. Yet, like most new sites (and as Jelena notes) it takes time to build up that information. In the meantime there are existing sites that have older databases of information, although even in school I accessed multiple sites in order to be able to pull together the various sources I needed at times. So you should not rely on just one location to be your entry point, even if it leads you to many doors.
I know this all. I use different sourcesouf course, like JSTOR, different electronic journals, you name it, but this the only site which has te articles I am looking for. The other digital librarier and journals don't have this articles or don't give access. Is it more clear now?
It depends on what you work. If is History of Medicine, for instance, 'PubMed' could be a great base. You have open access to many bases, as 'Scielo', and 'Latindex'. But If you have access to closed bases (usually is provided by your Institution), I suggest 'Ebscohost', 'BioOne', 'Duke Univ.Press', 'GaleGroup' and '18th century Colletions', 'Maney publishing', 'WileyOnlineLibrary', 'ProjectMuse', 'SpringerLink', 'Sciencedirect'(Elsevier), Cambridge &so on.
Brazilian universities have a Capes service, that unites all this bases (although not all journals are provided).
Contact your University, and learn how to access the databases closed.