In 1994 Lena Malm undertook a project whereby she sourced various other 'Lena Malms'. The project took her five years and by 1999 she managed to gather 55 Lena Malms. Funny to think that today, with Google (or Bing even), this search would've taken seconds to complete.
This article by Jennifer Allen builds on this and is a really great (short) read. Originally published in Frieze magazine issue 124, June-August 2009