Paper from 1969 not available ? is it possible? I was looking for the following paper (and this keeps coming up). I am not sure if it is copyrighted/available or not. < As a profane, I don't quite understand the process by which a paper from 1969 made by a university would not be publically accessible. Is it possible ?

If the university has an access to Springer, then more or less recent papers (say, up to 20-years-old, I don't remember details) are available to download from the university domain. Older papers are paid. My university has such an access. Of course, I was also surprised that old articles are impossible to download without extra money.