International Standard Serial Number
The International Standard Serial Number (ISSN) is an eightdigit unique number used to identify printed or electronic periodicals. Journals published in both media can have two ISSN numbers, print ISSN (pISSN) and electronic ISSN (eISSN or eISSN). The ISSN system was established as an ISO international standard in 1971 and was published as ISO 3297 in 1975. The ISO subcommittee TC 46 / SC 9 is responsible for the standard.
Code format
The ISSN code format is an eightdigit number, divided by a dash into two fourdigit numbers. The last digit, which can be 09 or X, is a check digit. For example, the ISSN journal Hearing Research is 03785955.
The following algorithm is used to calculate the check digit:
The sum of the first seven digits of the ISSN number multiplied by their position in the number is calculated, counting from the right, in other words 8, 7, 6, 5, 4, 3, and 2:
0
⋅
8
+
3
⋅
7
+
7
⋅
6
+
8
⋅
5
+
5
⋅
4
+
9
⋅
3
+
5
⋅
2
{\ displaystyle 0 \ cdot 8 + 3 \ cdot 7 + 7 \ cdot 6 + 8 \ cdot 5 + 5 \ cdot 4 + 9 \ cdot 3 + 5 \ cdot 2}
0
+
21
+
42
+
40
+
20
+
27
+
10
{\ displaystyle 0 + 21 + 42 + 40 + 20 + 27 + 10}
160
{\ displaystyle 160}
.
Then divide it by the module with 11 and determine the rest.
160
11
14
the rest
6
14
+
6
11
{\ displaystyle {\ frac {160} {11}} 14 {\ mbox {rest}} 6 14 + {\ frac {6} {11}}}
.If there is no residue, the check digit is 0, otherwise the remainder is subtracted from 11 to get a check digit:
11

6
5
{\ displaystyle 116 5}
The check digit is 5.X with a capital letter in the check digit denoting 10.
Reference