@article{DBLP:journals/gc/WangC03,
author = {Xin Wang and
Yanxun Chang},
title = {Self-Converse Directed BIBDs with Block Size Four},
journal = {Graphs and Combinatorics},
volume = {19},
number = {4},
year = {2003},
pages = {567-575},
ee = {http://dx.doi.org/10.1007/s00373-003-0535-y},
bibsource = {DBLP, http://dblp.uni-trier.de}
}