TREET

E.C. Haines, 1964. An experimental variant of LISP1.5,

implemented on the STRETCH computer. Basic structure was a

trinary tree.

["The TREET Time-Sharing System", H.A. Bayard et al, Proc

2nd Symp Symb and Alg Manip, ACM (Mar 1971)].

[Sammet 1969, pp.457-461].