What are the ozonolysis products of phenanthrene? What is / are the product(s) of ozonolysis of phenanthrene?

I am not sure I understand how to proceed. Which of the $\ce{C=C}$ double bonds is most susceptible to this type of reaction?
I am confused given the resonance and aromatic character of the compound which doesn't make me feel comfortable doing ozonolysis the usual way.
Phenanthrene reacts quickly with one mole of ozone at the 9,10-double bond according to this paper here and the OrgSyn procedure here referred to above by @Buttonwood. In chloroform a polymeric mono-ozonide is obtained. In MeOH the reaction takes a different course resulting in the formation of a cyclic methoxy-hydroxy-peroxide and a cyclic dimethoxy-peroxide. Reductive work up (Zn/AcOH or Me2S) of these products gives the di-aldehyde.