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The coexistence of the SP and the antiferromagnetic phases was recently treated by H. Fukuyama, T. Tanimoto and M. Saito, J. Phys. Soc. Japan,65, 1182 (1996). Our approach is rather similar, with one important difference: due to the presence of solitons the change of phase by π is allowed in our picture, whereas it is not realized in the solution obtained in the above cited paper.