Daniel O. Cajueiro, Roberto F. S. Andrade (May 2013). A dynamical programming approach for controlling the directed abelian Dhar-Ramaswamy model (Report). Physical Review E, Statistical, Nonlinear, and Soft Matter Physics. arXiv:1305.6668. Bibcode:2010PhRvE..82c1108C.
G. S. Joyce (1989). "On the Dhar directed-site animals-enumeration problem for the simple cubic lattice". Journal of Physics A: Mathematical and General. 22 (19): L919–L924. Bibcode:1989JPhA...22L.919J. doi:10.1088/0305-4470/22/19/001.
Mireille Bousquet-Mélou, Andrew R Conway (1996). "Enumeration of directed animals on an infinite family of lattices". Journal of Physics A: Mathematical and General. 29 (13): L919–L924. Bibcode:1989JPhA...22L.919J. doi:10.1088/0305-4470/22/19/001.
Daniel O. Cajueiro, Roberto F. S. Andrade (May 2013). A dynamical programming approach for controlling the directed abelian Dhar-Ramaswamy model (Report). Physical Review E, Statistical, Nonlinear, and Soft Matter Physics. arXiv:1305.6668. Bibcode:2010PhRvE..82c1108C.
G. S. Joyce (1989). "On the Dhar directed-site animals-enumeration problem for the simple cubic lattice". Journal of Physics A: Mathematical and General. 22 (19): L919–L924. Bibcode:1989JPhA...22L.919J. doi:10.1088/0305-4470/22/19/001.
Mireille Bousquet-Mélou, Andrew R Conway (1996). "Enumeration of directed animals on an infinite family of lattices". Journal of Physics A: Mathematical and General. 29 (13): L919–L924. Bibcode:1989JPhA...22L.919J. doi:10.1088/0305-4470/22/19/001.