Yejing Wang Jennifer Seberry Reihaneh Safavi-Naini Ryoh Fuji-Hara A Note on the Exposure Property of SBIBD. 225-227 2003 15 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/S1571-0653(04)00590-6 db/journals/endm/endm15.html#WangSSF03