Blume, C. "A Structured Way of Implementing the High Level Programming Language AL on a Mini- and Microcomputer Configuration"

Kosinski, M.S. (1976) Kosinski, M.S. "SPL/I Language Reference Manual" Intermetrics Report 172-1 (July 1976).  

Languages mentioned AL {1969} Assembler for robots Karlsruhe AL {1981} Karlsruhe version of AL