Open J. Discrete Math. Vol.2 No.1, January 20, 2012 DOI:10.4236/ojdm.2012.21007
Open J. Discrete Math. Vol.2 No.1, January 20, 2012 DOI:10.4236/ojdm.2012.21006
Open J. Discrete Math. Vol.2 No.1, January 20, 2012 DOI:10.4236/ojdm.2012.21005
Open J. Discrete Math. Vol.2 No.1, January 20, 2012 DOI:10.4236/ojdm.2012.21004
Open J. Discrete Math. Vol.2 No.1, January 20, 2012 DOI:10.4236/ojdm.2012.21003
Open J. Discrete Math. [ISSUE], [PUBDATE] DOI:[DOI]