Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revisiting pion electromagnetic form factor in perturbative QCD approach
  and its reliability   Again, this preprint has been combined with hep-ph/0207106, which is
co-authored by both of us. Therefore, this preprint has been withdrawn. Readers
are welcome to refer to hep-ph/0207106.

19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys