Is Lambda-Sigma-Calculus same as Sigma-Calculus?

From: Tian (wangtianthu_at_gmail.com)
Date: 01/31/05 

Date: 31 Jan 2005 14:27:12 -0800

I heard these two phrase recently but I don't know if there is
anything different between them. I just started doing some research on
the object theory and only got basic training in formal methods. Who
can recommend something to read about Sigma-Calculus?

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