TY - Acta mathematica scientia,Series B A1 - Pengyan WANG, Pengcheng NIU T1 - A PRIORI BOUNDS AND THE EXISTENCE OF POSITIVE SOLUTIONS FOR WEIGHTED FRACTIONAL SYSTEMS Y1 - 2021-10-25 JF - Acta mathematica scientia, Series B JO - Acta mathematica scientia,Series B SP - 1547 EP - 1568 VL - 41 IS - 5 UR - http://121.43.60.238/sxwlxbB N1 - 10.1007/s10473-021-0509-2 ER -