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<references>
<ref name=paterson>{{cite journal
| last = Paterson | first = Michael S. | author-link = Mike Paterson
| doi = 10.1002/sapm1970491105
▲ | journal = Studies in Applied Mathematics
| year = 1970}}
▲ | pages = 105–107
</ref>
<ref name=cassaigne-halava-harju-nicolas>
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| last = Heckman
| first = Christopher Carl
| title = The 2×2 Matrix Mortality Problem and Invertible
| class = math.RA
| year = 2019
|