WUTIPHOL SINTUNAVARATtran. 2026. ON GENERALIZED HYERS-ULAM STABILITY RESULTS FOR QUADRATIC JENSEN FUNCTIONAL EQUATIONS IN QUASI-β-NORMED SPACES. Journal of Mathematical Analysis. 17, 01 (Jul. 2026), 103–126. DOI:https://doi.org/10.5281/j3h7wy68.