I am wondering if there is an english translation of Kellerer's 1964 paper on existence of joint distributions with particular marginals. The german version is here: https://link.springer.com/content/pdf/10.1007/BF01360315.pdf
Any reference perhaps to a restatement of the result in english or french would be appreciated.
You can find a version of the main result, including an alternative proof, as Theorem 6 of