Resolving the singularity of the Hawking-Turok type instanton
  We point out that the singular instanton of Hawking-Turok type, in which the singularity occurs due to the divergence of a massless scalar field, can be generated by Euclideanized regular $p$-brane solutions in string (or M-) theory upon compactification to four dimensions. 
Takeshi Chiba