@article{HelfgottG99,
  title = {Tilings of Diamonds and Hexagons with Defects},
  author = {Harald Helfgott and Ira M. Gessel},
  year = {1999},
  url = {http://www.combinatorics.org/Volume_6/Abstracts/v6i1r16.html},
  researchr = {https://researchr.org/publication/HelfgottG99},
  cites = {0},
  citedby = {0},
  journal = {Electr. J. Comb.},
  volume = {6},
}