This is BibTeX, Version 0.99c (Web2C 7.5.4)
The top-level auxiliary file: pith.aux
The style file: acm.bst
Database file #1: refs.bib
Warning--empty title in metropolis53
You've used 33 entries,
            2253 wiz_defined-function locations,
            704 strings with 9250 characters,
and the built_in function-call counts, 10307 in all, are:
= -- 910
> -- 541
< -- 0
+ -- 232
- -- 190
* -- 757
:= -- 1712
add.period$ -- 102
call.type$ -- 33
change.case$ -- 188
chr.to.int$ -- 0
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format.name$ -- 190
if$ -- 2128
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int.to.str$ -- 33
missing$ -- 32
newline$ -- 171
num.names$ -- 66
pop$ -- 260
preamble$ -- 1
purify$ -- 161
quote$ -- 0
skip$ -- 232
stack$ -- 0
substring$ -- 401
swap$ -- 85
text.length$ -- 0
text.prefix$ -- 0
top$ -- 0
type$ -- 122
warning$ -- 1
while$ -- 80
width$ -- 35
write$ -- 330
(There was 1 warning)