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Juancho A. Collera, Marian P. Roque       Admissible perturbations of differential expressions with exponentially decaying coefficients preserving the nullities       Int. Journal of Math. Analysis, Vol. 7, 2013, no. 57, 2803-2810
      http://dx.doi.org/10.12988/ijma.2013.310250
Copyright © 2013 Juancho A. Collera and Marian P. Roque. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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