P233: accessible reference

Author: prabau

properties/P000233.md

@@ -20,7 +20,9 @@ This is equivalent to each of the following:
 
 The equivalence between the various conditions can be shown by arguments similar to those used in the definition of {P42}, in particular {{mathse:3002235}}.
 
-This property is used in the literature, but usually without a separate name. One exception is {{zb:0451.54017}}, where it is called "PCGS" (path connected generated space).
+This property is used in the literature, but usually without a separate name.
+One exception is {{zb:0451.54017}} (accessible [here](https://topology.nipissingu.ca/tp/reprints/v04/tp04204.pdf)),
+where it is called "PCGS" (path connectedly generated space).
 
 Compare with {P42}.