Can HPV be spread by oral sex?

Just wondering. Partner notified that she has the virus and I want to know what the risk is as regards oral sex. Post your source, if you have one, please. I've been reading all over and can't find any info with this particular angle addressed.

techman2009-09-01T00:18:45Z

very high risk. There is an epidemic of HPV relate infection as the result of oral sexual behaviour.
In his practice, Haddad has seen an increase in the number of younger people developing this cancer, people in their 30s and 40s. He attributes it in part to a "change in sexual behavior over the last decade." He says: "The idea that oral sex is risk-free is not correct. It comes with significant risks, and developing cancer is one of them."