Open J. Discrete Math. Vol.10 No.1, January 16, 2020 DOI:10.4236/ojdm.2020.101004
Open J. Discrete Math. Vol.10 No.1, January 10, 2020 DOI:10.4236/ojdm.2020.101003
Open J. Discrete Math. Vol.10 No.1, December 10, 2019 DOI:10.4236/ojdm.2020.101002
Open J. Discrete Math. Vol.10 No.1, November 11, 2019 DOI:10.4236/ojdm.2020.101001
Open J. Discrete Math. [ISSUE], [PUBDATE] DOI:[DOI]