Baier, S. (2004) An elementary approach to the twin primes problem. Monatshefte für Mathematik, 143 (4). pp. 269-283. ISSN 0026-9255
Baier, Stephan (2004) On the p^\lambda problem. Acta Arithmetica, 113. pp. 77-101. ISSN 0065-1036
Baier, Stephan (2004) A note on P-sets. Integers, 4. A13. ISSN 1867-0660