Geodesic
Involutory modules and involutory differential algebras
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 4 (1973), pp. 205-216.

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The paper deals with algebraic models of differential geometry. Prolongations of exterior differential algebras defined by exact sequences of free graduated modules over exterior algebra are considered. A graduated module is called involutory in a sense generalizing the use of this term by E. Cartan and Spencer. Using the notion of involutory graduated module, a criterion is found for the existence of an infinite sequenre of prolongations of a given differential algebra. 
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     author = {A. M. Vasil'ev},
     title = {Involutory modules and involutory differential algebras},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
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     publisher = {mathdoc},
     volume = {4},
     year = {1973},
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     url = {http://geodesic.mathdoc.fr/item/INTG_1973_4_a6/}
}
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A. M. Vasil'ev. Involutory modules and involutory differential algebras. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 4 (1973), pp. 205-216. http://geodesic.mathdoc.fr/item/INTG_1973_4_a6/