General Information on basics of bond valence approach:
               Brown, I. D.; The Chemical Bond in Inorganic Chemistry - The Bond Valence Model.
                              IUCr monographs on Crystallography 12, Oxford University Press, (2002).
               Brown, I. D.; Acta Cryst. B48 (1992) 553-572.
               Brown, I. D.; Acta Cryst. B53 (1997) 381-393.
               Burdett, J. K. & Hawthorne, F. C.; Am. Mineral. 78 (1993) 884-892.
               Byström, A. & Wilhelmi, K. A.; Acta Chem. Scand. 5 (1951) 1003-1010.
               Donnay, G. & Allmann, R.; Am. Mineral. 55 (1970) 1003-1015.
               Hawthorne, F. C.; Acta Cryst. B50 (1994) 481-510.
               Mohri, F.; Acta Cryst. B56 (2000) 626-638.
               Mohri, F.; Acta Cryst. B59 (2003) 190-208.
               Nalewajski, R. F.; Struct. Bonding, 80 (1993) 115-186.
               Preiser, Ch., Lösel, J., Brown, I. D., Kunz, M. & Skowron, A.;
                                              Acta Cryst. B55 (1999) 698-711.

Relations between bond softness and bond valence 
              Adams, St.  Acta Cryst. B57 (2001) 278.
              O'Keeffe, M. & Brese, N. E.; J. Am. Chem. Soc. 113 (1991) 3226-3229.
              Pearson, R. G. ; J. Am. Chem. Soc. 85 (1963) 3533-3539.
              Parr, R. G. & Pearson, R. G.; J. Am. Chem. Soc. 105 (1983) 7512-7516.
              Pearson, R. G. ; J. Am. Chem. Soc. 107 (1985) 6801-6806.
              Pearson, R. G. ; Inorg. Chem. 27 (1988) 734-740.
              Ray, N. K., Samuels, L. & Parr, R. G. (1979). J. Chem. Phys. 70, 3680-3684.
              Urusov, V. S. (1995). Acta Cryst. B51 (1988) 641-649.

Softness sensitive BV parameters for alkali compounds:
              Adams, St.  Acta Cryst. B57 (2001) 278.

Effect of pressure on bond valence parameters:
            Brown,I. D., Klages, P. and Skowron, A. . Acta Cryst. B59 (2003) 439-448.

Classical bond valence parameter tables:
            Brese, N. E. & O'Keeffe, M.; Acta Cryst. B47 (1991) 192-197.
            Brown, I. D. & Altermatt, D.; Acta Cryst. B41 (1985) 244-247.
            Brown, I. D.; in Structure and Bonding in Crystals, edited by M. O'Keeffe & A. Navrotsky,
                                             Vol. II, pp. 1-30. New York; Academic Press (1981).

Further sources of classical BV parameters
            Brown et al. Inorg. Chem. 23 (1984) 4506-4508.
            Burns, Ewing and Hawthorne Can. Miner. 35 (1997) 1551-1570.
            Garcia-Rodriguez, et al. Acta Cryst. B56 (2000) , 565-569.
            Gundemann, et al.; J. Phys. Chem. A 103 (1999) 4752-4754.
            Kanowitz and Palenik Inorg. Chem. 37 (1998) 2086-2088.
            Liu and Thorp Inorg. Chem. 32 (1993) 4102-4105.
            Mahapatra et al.1996 J. Amer.Chem. Soc. 118 (2000) 11558.
            Palenik Inorg. Chem. 36 (1997) 3394-3397 and 4888-4890.
            Radaev, S. F., Fink, L. & Trömel, M. Z. Kristallogr. Suppl. 8 (1994), 628.
            Shield, Raithby, Allen and Motherwell Acta Cryst.B56 (1999), 455-465.
            Tytko, Mehnike and Kurad (1999) Structure and Bonding 93(1999), 1-66.
            Wood, Abboud, Palenik and Palenik Inorg. Chem. 39 (2000), 2065-2068.
            Wood and Palenik Inorg. Chem. 37(1999), 4149-51, 38(1999), 1031-1034; 38(1999), 3926-3930;

Applications of BV parameters
            Adams, St., Ehses, K. H. & Spilker, J.; Acta Cryst. B49 (1993) 958-967.
            Adams, St. & Swenson, J.; Phys. Rev. Lett. 84 (2000) 4144-4147.
            Adams, St. & Swenson, J. Phys. Rev. B 64 (2001) 024204.
            Liebau, F. Z. Kristallogr. 215 (2000) 381-383.
            Swenson, J. & Adams, St.; Phys. Rev. B, 63 (2001), 054201.
            Swenson, J. & Adams, St.; Phys. Rev. Lett., 90 (2003), 155507.
            Waltersson, K.; Acta Cryst. A34 (1978) 901-905.
            Withers, R. L., Schmid, S. & Thompson, J. G. Prog. Solid State Chem. 26 (1998) 1-96.
            Zachariasen, W. H.; Acta Cryst. 7 (1954) 795-799.

Software:
            CCP14 overview on BV software UK   Australia
            BOND VALENCE WIZARD by Ivan P. Orlov and Konstantin Popov
            VALENCE:  Brown, I. D.; J. Appl. Cryst. 29 (1996) 479-480.
            BVparm by I.D: Brown: Comprehensive compilation of BV parameters in a CIF file

            WEBELEMENTS: Winter, M. (2000). http://www.webelements.com/ .
            The Visual Elements Periodic table .

Miscellaneous  related topics:
Allred, A. L. & Rochow, E. G.; J. Inorg. Nucl. Chem. 5 (1958) 264-268.
Bader, R. W. F.; Atoms in Molecules: A Quantum Theory, International Series of Monographs
                                       on Chemistry, Vol. 22. Clarendon Press, Oxford (1990).
Clementi, E., Raimondi, D. L. & Reinhardt, W. P.; J. Chem. Phys. 38 (1963) 2686-2689.
Pauling, L.; J. Am. Chem. Soc. 69 (1947) 541-553.
Pauling, L.; The Nature of the Chemical Bond, 3rd ed. Cornell University Press, Ithaca (1960).