@TechReport{      Baker,
  Author        = "Baker, Henry G.",
  date-added    = "2013-09-25 10:42:57 +0000",
  date-modified = "2013-09-25 10:43:15 +0000",
  Keywords      = "Petri nets",
  Title         = "Petri Nets and Languages",
  Year          = "1972",
  File          = "Petri Nets and Languages - Baker (0) (0) - a - a - v.pdf"
}

@TechReport{ Baker, Author = "Baker, Henry G.", date-added = "2013-09-25 10:42:57 +0000", date-modified = "2013-09-25 10:43:15 +0000", Keywords = "Petri nets", Title = "Petri Nets and Languages", Year = "1972", File = "Petri Nets and Languages - Baker (0) (0) - a - a - v.pdf" }