@Article{	  DiekertPS2024,
  author	= "Volker Diekert and Igor Potapov and Pavel Semukhin",
  title		= "Decidability of membership problems for flat rational
		  subsets of {GL(2,Z)} and singular matrices",
  pages		= "",
  publisher	= "SIAM",
  journal	= "SIAM Journal on Computing",
  year		= "2024",
  url		= "",
  doi		= "",
  note		= "To Appear"
}