@techreport{plt-tr2009-srfi-v4.1.4, author = {PLT}, title = {{SRFIs}: Libraries}, number = {PLT-TR2009-srfi-v4.1.4}, type = {Reference Manual}, institution = {PLT Scheme Inc.}, month = {January}, year = {2009}, url = {http://download.plt-scheme.org/doc/4.1.4/pdf/srfi.pdf}, note = {\url{http://plt-scheme.org/techreports/}} }