00321nam a2200121 a 450000500170000002000180001708200130003510000150004824500290006326000430009230000230013549000410015820251203111620.0  a9789380250045  a510bDEY  aDey, Aloke  aIncomplete block designs  aNew DelhibHindustan Book Agencyc2010  ax,279p.c24cm.bHB  aTexts and Readings in Mathematics 57