Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exchange-bond structure and magnetization-step spectra of a diluted
  Heisenberg antiferromagnet on the square lattice: Lopsided two-exchange
  models   Theoretycal results on the magnetization and susceptibility of a Heisenberg
diluted antiferromagnet in the square lattice are given. The models considered
have two exchange constants (J1-J2 and J1-J3) of which the second is much
smaller than the first (lopsided models). Cluster statistics for clusters with
up to 5 spins is given. A procedure to account for the contribution to the
magnetization of clusters with more than 5 spins is described.

31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics