Appl. Math. Vol.10 No.6, June 28, 2019 DOI:10.4236/am.2019.106034
Appl. Math. Vol.10 No.6, June 24, 2019 DOI:10.4236/am.2019.106033
Appl. Math. Vol.10 No.6, June 24, 2019 DOI:10.4236/am.2019.106032
Appl. Math. Vol.10 No.6, June 17, 2019 DOI:10.4236/am.2019.106031
Appl. Math. Vol.10 No.6, June 17, 2019 DOI:10.4236/am.2019.106030
Appl. Math. [ISSUE], [PUBDATE] DOI:[DOI]