Composite system controllability and observability. - William A. Wolovich; H. L. Hwang (Autom., 1974)

BIB(8, 56, 21, 3, 6) and BIB(10, 30, 9, 3, 2) Designs with Repeated Blocks. - A. Hedayat; H. L. Hwang (J. Comb. Theory A, 1984)

Construction of BIB Designs with Various Support Sizes-with Special Emphasis for v = 8 and k = 4. - A. Hedayat; H. L. Hwang (J. Comb. Theory A, 1984)