Fischer, Herbert Max Planck Institute for Medical Research, Max Planck Society;
Kollmar, Herbert Max Planck Institute for Medical Research, Max Planck Society;
https://link.springer.com/content/pdf/10.1007%2FBF00527554.pdf (Any fulltext)
https://doi.org/10.1007/BF00527554 (Any fulltext)
Fischer, H., & Kollmar, H. (1968). Zur Invarianz in der LCAO MO Theorie. Theoretica Chimica Acta, 12(4), 344-348. doi:10.1007/BF00527554.