@article {3531,
	title = {Access Control for Private Declarations in Ada},
	journal = {Computer Languages, Systems \& Structures},
	volume = {20},
	year = {1994},
	pages = {117--126},
	doi = {10.1016/0096-0551(94)90018-3},
	author = {Jun Shen and Gordon Cormack}
}
