The OOPSLA 1997 paper that introduced Squeak, a Smalltalk implementation “written in itself”:

Squeak is an open, highly-portable Smalltalk implementation whose virtual machine is written entirely in Smalltalk, making it easy to debug, analyze, and change. To achieve practical performance, a translator produces an equivalent C program whose performance is comparable to commercial Smalltalks.

The paper discusses the bootstrapping process, the VM’s object format and garbage collector, the Smalltalk-subset-to-C translation process, the implementations’ approach to the BitBlt graphics primitive, performance, and the fledgling Squeak community. The latter is still going strong thirty-some years later.