IN My humble opinion , Interest tracing rules would apply, and you get the deduction. The question about home interest refers to a " Interest on home equity loans and lines of credit only if the borrowed funds are used to buy, build, or substantially improve the taxpayer's home ", which clearly this is not your case, So under today's law it would not qualify as home mtge interest in any way. Therefore it is not anything except your debt.
I know you asked for citations, these may be on point.
If you borrow money to buy a property, it would seem that it makes no difference where you got it. Tracing rules §1.163-8T
http://www.gpo.gov/fdsys/pkg/CFR-2012-title26-vol2/pdf/CFR-2012-title26-vol2-sec1-163-8T.pdf this reg says allocate in the manner the expenditure has been made.
An esteemed scholar wrote this.
I reference you to the last paragraph
i hope this helps.