RT Journal T1 THE OPTIMAL REINSURANCE-INVESTMENT PROBLEM CONSIDERING THE JOINT INTERESTS OF AN INSURER AND A REINSURER UNDER HARA UTILITY* A1 Yan Zhang, Peibiao Zhao, Huaren Zhou PB 数学物理学报(英文版) FD 2023-02-25 YR 2023 JF Acta Mathematica Scientia JO 数学物理学报(英文版) VO 43 IS 1 SP 97 DO 10.1007/s10473-023-0107-6 K1 reinsurance;investment;HARA utility;Heston model;Legendre transform LK {http://121.43.60.238/sxwlxbB/CN/article/article_16909.shtml}