On Lower Bounds For Covering Codes. - Mahesh C. Bhandari; K. K. P. Chanduka; Arbind K. Lal (Des. Codes Cryptogr., 1998)

Lower Bounds for Group Covering Designs. - K. K. P. Chanduka; Mahesh C. Bhandari; Arbind K. Lal (AAECC, 1999)