@Article{	  zalinescu:shorter:2011,
  author	= {Eugen Zalinescu},
  journal	= {Information Processing Letters},
  language	= {USenglish},
  number	= 12,
  title		= {Shorter strings containing all $k$-element permutations},
  url		= {http://dx.doi.org/10.1016/j.ipl.2011.03.018},
  volume	= 111,
  year		= 2011,
  user		= {zeugen}
}