404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=http%3A%2F%2Fpapers.sae.org%2F2000-01-0567%2F&title=Control%20Oriented%20Modeling%20of%20a%20Pressure%20Wave%20Supercharger was not found on this server. That’s all we know.