@article{welker_1980, 
  title={Superconductivity and Mixed Conduction}, 
  volume={35}, 
  DOI={10.1515/zna-1980-0901}, 
  abstractNote={<jats:title>Abstract</jats:title><jats:p>The BCS-formula for the energy gap ΔE is extended to include the magnetic exchange interaction of electrons with holes. With the improved expression for ΔE the transition temperatures of A15-structures are computed and found to be in a satisfactory agreement with the experimental values.</jats:p>}, 
  publisher={Walter de Gruyter GmbH}, 
  author={Welker}, 
  year={1980}, 
  month={Jan}
  }