The Servetus Controversy: What was Calvin's involvement?

The "Servetus Controversy" tells of a man named Michael Servetus who was burned at the stake for heresy -- not by Roman Catholic Inquisitors, but by Protestants in 16th century Geneva, France. *Here* is a brief description of the event in a document at Calvin.edu, and *here* is a link to a Youtube video of a panel of Calvinist pastors discussing the topic at a conference. **Are there any authoritative historic documents that shed further light on what Calvin's involvement may have been?**