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You'll need to contact the original author and/or their publisher. Either one will direct you to the correct person to deal with - there's no blanket rule over who has which rights, so you'll need ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/6119 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6119 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You'll need to contact the original author and/or their publisher. Either one will direct you to the correct person to deal with - there's no blanket rule over who has which rights, so you'll need to check who's got translation rights in your specific case, and whether that person is willing to let you translate the material "officially." Your case is even harder, since it sounds like you're running out of related people you can contact. The piece may well be an [orphan work](http://en.wikipedia.org/wiki/Orphan_works), and as far as I can see, there is no legal way to use such a work. So the bottom line is: you'll need to search out whatever connection you possibly can. Approach every angle that presents itself. Once you make contact with _somebody_, you'll (hopefully) have an easier time finding the person you're ultimately looking for. If you do make contact, be sure to be clear on what type of publication you're aiming for - publishing freely on the web is very different than print publishing for profit; you might be able to get permission for one but not the other.