Note 5 at Ac 19:11: The Greek words that are translated "special" here mean "'not common or ordinary'" (Vine's Expository Dictionary). There is no record of others performing miracles like these. However, Paul's own words to the Galatians show that the working of miracles was not according to people's goodness but rather their faith (Ga 3:5). Therefore, the reason these miracles were not performed by others was that they didn't believe for them.