@article {3509,
	title = {Three-Layered Source-Code Modelling},
	journal = {Electronic Notes in Theoretical Computer Science (ENTCS)},
	volume = {94},
	year = {2004},
	pages = {71--79},
	doi = {10.1016/j.entcs.2004.01.003},
	author = {Anthony Cox and Charles Clarke}
}
