'Where can I find authoritative information on the store buffer (STB) depth of the Cortex-A53?

I was unable to find information about how many entries the store buffer of a ARM Cortex-A53 core has. Others (https://dl.acm.org/doi/pdf/10.1145/3466752.3480042) have stated that it has a depth of four, but apparently no source is given.

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'Where can I find authoritative information on the store buffer (STB) depth of the Cortex-A53?

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