@phdthesis{ethos-0,
  title = {Computational complexity on register machines},
  author = {Richard S. Bird},
  year = {1974},
  url = {http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.644167},
  note = {British Library, EThOS},
  researchr = {https://researchr.org/publication/ethos-0},
  cites = {0},
  citedby = {0},
  school = {Imperial College London, UK},
}