Geodesic
On approximation of the differentiation operator over the class of twice differentiable functions in the space $L_2(0,\infty)$
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 4 (1996), pp. 162-170 
A. L. Rublev. On approximation of the differentiation operator over the class of twice differentiable functions in the space $L_2(0,\infty)$. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 4 (1996), pp. 162-170. http://geodesic.mathdoc.fr/item/TIMM_1996_4_a12/
@article{TIMM_1996_4_a12,
     author = {A. L. Rublev},
     title = {On approximation of the differentiation operator over the class of twice differentiable functions in the space $L_2(0,\infty)$},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {162--170},
     year = {1996},
     volume = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_1996_4_a12/}
}
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