Geodesic
On the class number of exact ideals for $Z$-rings in a commutative $Q$-algebra
Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 381-388.

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The finiteness of the class number of exact $\Lambda$-ideals for a $Z$-ring $\Lambda$ in a commutative algebra with unity over the rational number field is proved. 
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     author = {I. A. Levina},
     title = {On the class number of exact ideals for $Z$-rings in a commutative $Q$-algebra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {381--388},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a3/}
}
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I. A. Levina. On the class number of exact ideals for $Z$-rings in a commutative $Q$-algebra. Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 381-388. http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a3/