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1. Rico-Juan, J. R.; Calera-Rubio, J.; Carrasco, R. C.
   "Smoothing and compression with stochastic k-testable tree languages"
   Pattern Recognition, vol. 38, pp. 1420--1430 (2005)
   : bibtex
   Abstract:

   In this paper, we describe a generalization for tree stochastic languages of k-gram models. These models are based on the k-testable class,a subclass of the languages recognizable by ascending tree auntomata. One of the advantages of this approchis that the probabilistic model can be updated in an incremental fashion. Another feature is that backing-off schemes can be defined. As an illustration of their applicability, they have been used to compress tree data files at a better rate than string-based methods.

@article {
 author = "Rico-Juan, J. R.; Calera-Rubio, J.; Carrasco, R. C.",
 title  = "Smoothing and compression with stochastic k-testable tree languages",
 journal = "Pattern Recognition",
 number = "9",
 pages = "1420--1430",
 volume = "38",
 year = "2005"
}