In this paper we investigate the relationship among the following integrals where , , , and where is an arbitrary harmonic function on the unit ball . Growth of the integral means of harmonic functions is also compared to the integral means of their gradient.
Stevo STEVIĆ. "Area type inequalities and integral means of harmonic functions on the unit ball." J. Math. Soc. Japan 59 (2) 583 - 601, April, 2007. https://doi.org/10.2969/jmsj/05920583