Open J. Discrete Math. Vol.1 No.2, July 18, 2011 DOI:10.4236/ojdm.2011.12011
Open J. Discrete Math. Vol.1 No.2, July 08, 2011 DOI:10.4236/ojdm.2011.12012
Open J. Discrete Math. Vol.1 No.2, July 08, 2011 DOI:10.4236/ojdm.2011.12007
Open J. Discrete Math. Vol.1 No.2, July 06, 2011 DOI:10.4236/ojdm.2011.12005
Open J. Discrete Math. Vol.1 No.2, July 06, 2011 DOI:10.4236/ojdm.2011.12006
Open J. Discrete Math. [ISSUE], [PUBDATE] DOI:[DOI]