Geodesic
The basis of identities of the matrix algebra of the second order over $\mathbb Z_{p^2}$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 2, pp. 501-531 
A. N. Oleksenko. The basis of identities of the matrix algebra of the second order over $\mathbb Z_{p^2}$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 6 (2000) no. 2, pp. 501-531. http://geodesic.mathdoc.fr/item/FPM_2000_6_2_a10/
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     title = {The basis of identities of the matrix algebra of the second order over $\mathbb Z_{p^2}$},
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Voir la notice de l'article provenant de la source Math-Net.Ru

There are found 7 polynomials which generate the ideal of identities of the ring $M_2(\mathbb Z_{p^2})$.