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It is shown that the relativistic gluon corrections for the states with j""'O are consistently included in the instantaneous ladder BS equation but the higher-order kernels may contribute to the ground states with j=O. The retardation correction is examined. The relativistic effect is shown to be essential to get the reasonable value for M(T/e).doi:10.1143/ptp.76.567 fatcat:nbluhhalhzgtxdn6u6nxxmfzsm