1. D. Braga, J. Chem. Soc. Dalton Trans. (2000) 3705.
2. G.R. Desiraju, J. Chem. Soc. Dalton Trans. (2000) 3745.
3. A Solid-State NMR, X-ray Diffraction, and ab Initio Computational Study of Hydrogen-Bond Structure and Dynamics of Pyrazole-4-Carboxylic Acid Chains
4. Some examples of chains: (a) R. Graziani, U. Castellato, R. Ettore, G. Plazzogna, J. Chem. Soc. Dalton Trans. (1982) 805. (b) J.D. Crane, O.D. Fox, E. Sinn, J. Chem. Soc. Dalton Trans. (1999) 1461. (c) K. Sakai, Y. Tomita, T. Ue, K. Goshima, M. Ohminato, T. Tsubomura, K. Matsumoto, K. Ohmura, K. Kawakami, Inorg. Chim. Acta 64 (2000) 297. (d) A. Chadghan, J. Pons, A. Caubet, J. Casabó. J. Ros, A. Alvarez-Larena, J.F. Piniella, Polyhedron 19 (2000) 855.
5. Some examples of dimers: (a) M.A. Cinellu, S. Stoccoro, G. Minghetti, A.L. Bandini, G. Banditelli, B. Bovio, J. Organomet. Chem. 372 (1989) 311. (b) M. Munakata, L.P. Wu, M. Yamamoto, T. Kuroda-Sowa, M. Maekawa, S. Kawata, S. Kitagawa, J. Chem. Soc. Dalton Trans. (1995) 4099. (c) G.A. Ardizzoia, G. La Monica, S. Cenini, M. Moret, N. Maschioni, J. Chem. Soc. Dalton Trans. (1996) 1351. (d) I.A. Guzei, C.H. Winter, Inorg. Chem. 36 (1997) 4415. (e) S.M. Couchman, J.C. Jeffery, M.D. Ward, Polyhedron (1999) 18, 2633.