Geodesic
About characteristics of graded algebras $S_{1,4}$ and $SI_{1,4}$
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2010), pp. 23-32

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Hilbert series for the graded algebras of comitants $S_{1,4}$ and invariants $SI_{1,4}$ of differential system are constructed and with their help the Krull dimensions of these algebras are determined. The lower bounds for the number of the types of generators for the algebras $S_{1,4}$ and $SI_{1,4}$ are obtained. 
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     author = {N. Gherstega and M. Popa and V. Pricop},
     title = {About characteristics of graded algebras $S_{1,4}$ and $SI_{1,4}$},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {23--32},
     publisher = {mathdoc},
     number = {1},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2010_1_a1/}
}
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N. Gherstega; M. Popa; V. Pricop. About characteristics of graded algebras $S_{1,4}$ and $SI_{1,4}$. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2010), pp. 23-32. http://geodesic.mathdoc.fr/item/BASM_2010_1_a1/