Authors A and B proposed it. Being that proposed is in the past tense, you would use the past perfect "were obtained" rather than the present perfect "are obtained."
Now, that said, since you are saying "by them," thus attributing the action to someone and negating any need for the passive voice, it becomes advisable to instead say, "They also obtained the error bounds of the method ("error bounds" italicized due to it not being clear whether or not this term is correct)."
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