Hao Ladi; Guan Wei; Yu Huadong First-author s addressEditorial Office of Journal of Dalian Fisheries University; 116023; Dalian; Liaoning; China;

• 大连水产学院学报编辑部;辽宁师范大学学报编辑部;数学研究与评论杂志编辑部;116029;116024辽宁大连;