<s>
The	O
Astrophysics	B-Application
Source	I-Application
Code	I-Application
Library	I-Application
(	O
ASCL	O
)	O
is	O
an	O
online	O
registry	O
of	O
scientist-written	O
software	O
used	O
in	O
astronomy	O
or	O
astrophysics	O
research	O
.	O
</s>
<s>
Entries	O
in	O
the	O
ASCL	O
are	O
indexed	O
by	O
the	O
SAO/NASA	B-Application
Astrophysics	I-Application
Data	I-Application
System	I-Application
(	O
ADS	B-Application
)	O
and	O
Web	B-Library
of	I-Library
Science	I-Library
's	O
Data	O
Citation	O
Index	O
and	O
because	O
each	O
code	O
is	O
assigned	O
a	O
unique	O
ascl	O
ID	O
,	O
software	O
can	O
be	O
cited	O
in	O
a	O
journal	O
paper	O
even	O
when	O
there	O
is	O
no	O
citable	O
paper	O
describing	O
the	O
code	O
.	O
</s>
<s>
Web	B-Library
of	I-Library
Science	I-Library
and	O
ADS	B-Application
indexing	O
makes	O
research	O
software	O
more	O
discoverable	O
.	O
</s>
<s>
Additionally	O
,	O
ADS	B-Application
can	O
link	O
some	O
papers	O
which	O
use	O
codes	O
to	O
the	O
code	O
entries	O
,	O
which	O
makes	O
it	O
easier	O
to	O
examine	O
the	O
computational	O
methods	O
used	O
.	O
</s>
<s>
ADS	B-Application
also	O
tracks	O
citations	O
for	O
software	O
(	O
assuming	O
the	O
citations	O
are	O
formatted	O
correctly	O
)	O
,	O
which	O
can	O
help	O
research	O
software	O
authors	O
for	O
whom	O
citations	O
are	O
an	O
important	O
measure	O
.	O
</s>
