Bernstein, Morton I. "Computer input/output of two-dimensional notations" pp102-103
(1971)
[SYMSAM 71] (1971)
[ACM] Proceedings of the Second Symposium on Symbolic and Algebraic Manipulation, March 23-25, 1971 Los Angeles (SYMSAM 71)
Languages mentioned
Bernstein
{1968} Maths input language