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Continue to ChatUlam stability of a boundary value problem - https://avesis.yyu.edu.tr/yayin/c5ea22ba-ffef-483d-887f-d9a2e402466c/ulam-stability-of-a-boundary-value-problem
Ulam stability of a boundary value problem - https://avesis.yyu.edu.tr/yayin/c5ea22ba-ffef-483d-887f-d9a2e402466c/ulam-stability-of-a-boundary-value-problem