@Unpublished{SCI:Ber1991c,
  author =    "M. Berzins",
  title =     "Balancing Space and Time Errors for Spectral
              Methods used with the Method of Lines for Parabolic
              equations",
  year =      "1991",
  url =       "http://www.sci.utah.edu/publications/Ber1991c/4219_001.pdf",
}