[1
]College of Economics and Management, Northeast Agricultural University, Harbin, Heilongjiang,
China
[2
]Haikou University of Economics, Haikou, Hainan, China
[3
]Heilongjiang Agricultural Reclamation Management Cadre College, Harbin, China
[4
]International Cultural and Educational College, Northeast Agricultural University,
Harbin, Heilongjiang, China
[5
]Facultad de Ciencias Adminsitrativas y Económicas, Universidad Tecnológica Indoamérica,
Quito, Ecuador
[6
]Department of Mathematics, Government College Raigaon, Satna, Madhya Pradesh, India