Balke, K. G. and Carter, G. L., "The COLASL Automatic Coding Language" pp501-537

(1962) Symbolic Languages in Data Processing, in the Proceedings of the Symposium organized and edited by the International Computation Centre, Rome, Italy, March 26­31, 1962, Gordon and Beech Science Publishers, 1962.  

Languages mentioned COLASL {1962} Two dimensional mathematical language