Based on old version: http://erlang.org/download/getting_started-5.4.pdf
New version is at: http://erlang.org/doc/getting_started/seq_prog.html#id64778
Based on old version: http://erlang.org/download/getting_started-5.4.pdf
New version is at: http://erlang.org/doc/getting_started/seq_prog.html#id64778