diff --git a/src/references.gmo b/src/references.gmo
index 7606425..82fb8f0 100644
--- a/src/references.gmo
+++ b/src/references.gmo
@@ -37,6 +37,12 @@ texts by solderpunk in the {gemini} protocol
 => https://www.youtube.com/watch?v=YMKJ7S7fKOk Rare Earthenware - Unknown Fields 
 => https://web.archive.org/web/20210415134117/http://www.unknownfieldsdivision.com/summer2014china-aworldadriftpart02.html Unknown Fields Division - Summer 2014 China Cargo ship expedition
 
+# computer science
+
+=> https://archive.org/details/computationfinit0000mins/ Computation: finite and infinite machines (1967) Minsky 
+
+=> https://www.semanticscholar.org/paper/Universality-of-Tag-Systems-with-P-%3D-2-Cocke-Minsky/ada3045434a410b4e84d2944590ff54fe5daa4ef Universality of Tag Systems with P = 2 (1964) Cocke and Minsky
+
 # non-electronic computers
 			
 => https://xkcd.com/505  - randall munroe, xkcd