Appl. Math. Vol.10 No.7, July 29, 2019 DOI:10.4236/am.2019.107044
Appl. Math. Vol.10 No.7, July 24, 2019 DOI:10.4236/am.2019.107043
Appl. Math. Vol.10 No.7, July 24, 2019 DOI:10.4236/am.2019.107042
Appl. Math. Vol.10 No.7, July 23, 2019 DOI:10.4236/am.2019.107041
Appl. Math. Vol.10 No.7, July 23, 2019 DOI:10.4236/am.2019.107040
Appl. Math. [ISSUE], [PUBDATE] DOI:[DOI]