Swianiewicz, J. The Language For Computer Description. pp191-201

Information Processing Machines: Proceedings of th (1965) Information Processing Machines: Proceedings of the Symposium held in Prague on September 7th-9th, 1964. Czechislovak Academy of Sciences (Prague) and Iliffe Books, Ltd. (London) 1965  

Languages mentioned Language for computer description {1964} Hardware based description language