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Glossary 
Patents Index: literature (750 Artikel)
| Abakus in Youtube | to | Butzbach/Bethmann 1991 |
| BZB | to | Geppert 2016 |
| Gibson/Sterling 1991 | to | Ifrah 1989 |
| IM2011 | to | Menninger 1957 |
| Merzbach 1977 | to | Reese 10.2012 |
| Reese 1995 | to | Stoll 2004b |
| Stoll 2006 | to | Weiss 2015.2 |
| Weiss 2015.3 | to | Zühlke 1952 |