Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropy of DC Electric Field Influence on Acoustic Wave Propagation
  in Piezoelectric Plate   Anisotropy of dc electric field influence on the different types of acoustic
waves in piezoelectric plate has been investigated by means of computer
simulation. Detail calculations have made for bismuth germanium oxide crystals.

5
The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: econ
29
The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin