What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
В Финляндии предупредили об опасном шаге ЕС против России09:28
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如今蓝梦之歌已经在广西北海港暂停运营了，未来还会不会重新跑起来也是未知数，业内盛传的说法是，它也已经被摆上货架，就等买家接手了。
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