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Explanation: Without wish to cast doubt on my esteemed colleague's abilities I would like to humbly point out that since we are talking about more than one writer the possessive is written with the apostrophe after the s and not before. It must have been a typing error!
Native English and Swedish speaker.
Sven Petersson Sweden Local time: 16:21 Native speaker of: Swedish, English PRO pts in pair: 8128