no. 2
The cokernel of the operator ∂/∂x n acting on a 𝒟 n -module, II
Compositio Mathematica, Tome 56 (1985) no. 2, pp. 259-269. 
@article{CM_1985__56_2_259_0,
     author = {Van den Essen, Arno},
     title = {The cokernel of the operator $\partial / \partial x_n$ acting on a $\mathcal {D}_n$-module, {II}},
     journal = {Compositio Mathematica},
     pages = {259--269},
     publisher = {Martinus Nijhoff Publishers},
     volume = {56},
     number = {2},
     year = {1985},
     zbl = {0579.58040},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1985__56_2_259_0/}
}
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Van den Essen, Arno. The cokernel of the operator $\partial / \partial x_n$ acting on a $\mathcal {D}_n$-module, II. Compositio Mathematica, Tome 56 (1985) no. 2, pp. 259-269. http://archive.numdam.org/item/CM_1985__56_2_259_0/

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