Geodesic
A~family of maximal subalgebras of R.~Robinson's algebra
Matematičeskie zametki, Tome 22 (1977) no. 4, pp. 511-516.

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All maximal sub algebras of the algebra of primitive recursive functions $\langle\Phi;+,*,i\rangle$, whose basic sets contain the set $$ A+\{f:f\equiv0\vee(\forall\,x)(x>0\Rightarrow f(x)>0)\} $$ are described. It is shown that they are continuum in number. 
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     author = {A. N. Degtev},
     title = {A~family of maximal subalgebras of {R.~Robinson's} algebra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {511--516},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_4_a5/}
}
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A. N. Degtev. A~family of maximal subalgebras of R.~Robinson's algebra. Matematičeskie zametki, Tome 22 (1977) no. 4, pp. 511-516. http://geodesic.mathdoc.fr/item/MZM_1977_22_4_a5/