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2. Approximation algorithms for maximum two-dimensional pattern matching
   Srinivasa Rao Arikati, Anders Dessmark, Andrzej Lingas, and Madhav V. Marathe
   In: Combinatorial Pattern Matching: 7th Annual Symposium, CPM96, Laguna Beach, California, USA, June, 1996, 348-360
   
1. Approximation algorithms for maximum two-dimensional pattern matching
   Srinivasa Rao Arikati, Anders Dessmark, Andrzej Lingas, and Madhav V. Marathe
   Theoretical Computer Science 255 (1/2): 51-62, 2001