2 joint papers of Howard L. Hiller with Shelah

HHSh:91
Hiller+Huber+Shelah, The structure of ${\rm Ext}(A, {\bf Z})$ and $V=L$ -- Math Zeitschrift 162 (1978) 39-50
HiSh:59
Hiller+Shelah, Singular cohomology in $L$ -- Israel J Math 26 (1977) 313-319