This is BibTeX, Version 0.99d (TeX Live 2017/Debian)
Capacity: max_strings=100000, hash_size=100000, hash_prime=85009
The top-level auxiliary file: bibtex-natdin.aux
The style file: natdin.bst
Reallocated singl_function (elt_size=4) to 100 items from 50.
Reallocated singl_function (elt_size=4) to 100 items from 50.
Reallocated wiz_functions (elt_size=4) to 6000 items from 3000.
Reallocated singl_function (elt_size=4) to 100 items from 50.
Reallocated singl_function (elt_size=4) to 100 items from 50.
Database file #1: collection.bib
You've used 3 entries,
            4728 wiz_defined-function locations,
            907 strings with 6720 characters,
and the built_in function-call counts, 1562 in all, are:
= -- 149
> -- 30
< -- 30
+ -- 37
- -- 10
* -- 104
:= -- 282
add.period$ -- 4
call.type$ -- 3
change.case$ -- 12
chr.to.int$ -- 3
cite$ -- 3
duplicate$ -- 55
empty$ -- 134
format.name$ -- 18
if$ -- 311
int.to.chr$ -- 1
int.to.str$ -- 1
missing$ -- 12
newline$ -- 34
num.names$ -- 12
pop$ -- 19
preamble$ -- 1
purify$ -- 18
quote$ -- 0
skip$ -- 78
stack$ -- 0
substring$ -- 96
swap$ -- 7
text.length$ -- 4
text.prefix$ -- 0
top$ -- 0
type$ -- 24
warning$ -- 0
while$ -- 13
width$ -- 0
write$ -- 57