TY  - BOOK
AU  - Wallis, W. D.
AU  - Street, Anne Penfold
AU  - Wallis, Jennifer S.
TI  - Combinatorics: ; room squares, sum-free sets, hadamard matrices 
T2  - Lecture notes in Mathematics
U1  - 511.6 
PY  - 1972///
CY  - Berlin
PB  - Springer-Verlag
ER  -