On calculational proofs

From Tetherless World Wiki

\begin{bibtex} @article{DBLP:journals/apal/Lifschitz01,

 author    = {Vladimir Lifschitz},
 title     = {On calculational proofs},
 journal   = {Ann. Pure Appl. Logic},
 volume    = {113},
 number    = {1-3},
 year      = {2001},
 pages     = {207-224},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}