Sandip Kundu On Construction of Non-systematic t-Symmetric Error Correcting/All Unidirectional Error Detecting Codes. 596-599 1995 78-D IEICE Trans. Inf. Syst. 5 http://search.ieice.org/bin/summary.php?id=e78-d_5_596 db/journals/ieicet/ieicet78d.html#Kundu95