Geodesic
On the isomorphisms of the maximum subalgebras of the R.~Robinson algebra
Algebra i logika, Tome 6 (1967) no. 3, pp. 91-99.

Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that the maximum subalgebras of the R. Robinson algebra (if they differ from $\mathfrak{A}_{\{0\}}$) can not be isomorphic to the arbitrary subalgebra of the same algebra and the subalgebra $\mathfrak{A}_{\{0\}}$ is isomorphic to the countable set of its own subalgebras of the special type. 
@article{AL_1967_6_3_a9,
     author = {V. A. Sokolov},
     title = {On the isomorphisms of the maximum subalgebras of the {R.~Robinson} algebra},
     journal = {Algebra i logika},
     pages = {91--99},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1967_6_3_a9/}
}
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V. A. Sokolov. On the isomorphisms of the maximum subalgebras of the R.~Robinson algebra. Algebra i logika, Tome 6 (1967) no. 3, pp. 91-99. http://geodesic.mathdoc.fr/item/AL_1967_6_3_a9/