“…Also, it is very easy to show that BSEC (v, k, ) is equivalent to BSA(v, k, ; 1) (Wei, 2002). Thus, in the context of block designs (in the form of either BSEC, BSA or PBIBD), the work with limited distance m appeared in Hedayat et al (1988a, b), See et al (1997), Ling (1998, 1999), Stufken et al (1999), Stufken and Wright (2001), Wei (2002), Zhang and Chang (2005a, b, 2006, 2007, Bhattacharyya et al (2008), Dukes and Ling (2008) and Mandal et al (2008aMandal et al ( , b, 2009.…”