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A simple, basic, argument is given, based solely on energy-momentumconsiderations to recover conditions under which a_r affine or conformal Todafield theories can support defects of integrable type. Associated trianglerelations are solved to provide expressions for transmission matrices thatgeneralize previously known examples calculated for the sine-Gordon model andthe a_2 affine Toda model.

Comments on defects in the a_r Toda field theories