A few key references that were very important in this project are:
The paper by Raffennetti on design and optimization of even-tempered STO basis sets[Raffenetti, 1973 #1143]. The paper by Del Chong describes completeness profiles as a visual tool in estimating the completeness of a basis set[Chong, 1995 #1215]. Finally, Zeiss and coworkers [Zeiss, (1979) #1216] describe field-induced polarization functions for STOs. These are useful for defining basis sets with diffuse functions for (hyper)polarizability and other property calculations.
More recent references:
E. van Lenthe, E.J. Baerends,
Optimized Slater-type basis sets for the elements 1-118,
J. Comp. Chem. 24 (2003) 1142-1156.
D.P. Chong, E. Lenthe, S.J.A. van Gisbergen, E.J. Baerends,
Even-tempered Slater-Type orbitals revisited: From Hydrogen to Krypton,
J. Comp. Chem. 25 (2004) 1030-1036.
