Text this: Existence and blow up of solutions of a viscoelastic <mml:math display="inline"><mml:mrow><mml:mi>m</mml:mi><mml:mo class="MathClass-open">(</mml:mo><mml:mi>x</mml:mi><mml:mo class="MathClass-close">)</mml:mo></mml:mrow></mml:math>-biharmonic equation with logarithmic source term