@article{Waddell:fixing-letrec,
author = {Oscar Waddell and Dipanwita Sarkar and R. Kent Dybvig},
title = {Letrec: A Faithful Yet Efficient Implementation of Scheme's
Recursive Binding Construct},
journal = {Higher-order and and symbolic computation},
year = 2004,
texturl = "http://www.cs.indiana.edu/~dyb/pubs/fixing-letrec.pdf",
abstracturl = "http://www.cs.indiana.edu/~dyb/pubs/fixing-letrec-abstract.html",
note = "to appear",
annote = {Describes how Chez Scheme handles {\tt letrec} expressions
          efficiently and with full enforcement of the revised
          report's restriction preventing evaluation of left-hand-side
          variable references and assignments before the righ-hand
          sides have been evaluated.}}