@misc{unknown-ZZT-World-ZZT-v3-1-September-1991-Registered-,
 kind = {ZZT World},
 note = {rev 5dsC18WhGYcQUfiT8X3G5fBmnMssAq},
 publisher = {Potomac Computer Systems},
 title = {ZZT v3.1 (September 1991, Registered)},
 version = {rev 5dsC18WhGYcQUfiT8X3G5fBmnMssAq}
}