1 joint paper of Karsten Steffens with Shelah

NShS:557 2003-01-20 [pdf] [ps] [abstract] [arXiv:math.LO/0404179]
Niedermeyer+Shelah+Steffens, The $f$-Factor Problem for Graphs and the Hereditary Property -- Archive for Math Logic 45 (2006) 665-672