Biological effect of Rf radiation and for its impact analysis both field and frequency consideration are important. But tissue heating impact either influenced by field or frequency (considering penetration level) is required to know clearly.
There are FCC standards talking about "skin depth and specific absorption rate". There are many articles available in Google search when you put the quoted text above. That will help you a lot. Also the biological effect is destruction of cells and mutation (which may even lead to cancer) based on the radiation levels. Please do a Google and you will get lot of info on this.
Yes, i have gone through several journals but heating effect and biological effect might be not the same since heating effect involved with specific absorption rate (SAR) where as several biological effects involvement with frequency . But frequency has specific length dependent interaction with tissues or cells and penetration depth into the biological system also depends on range of frequency, its dielectric properties as well.