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3. Å hag, P., Czyż, R., Pham, H.H.: Concerning the energy class $$\epsilon_{p}$$ for 0 < p < 1, IMUJ Preprint 7 (2005)
4. Å hag P., Czyż R.: The connection between the Cegrell classes and compliant functions. Math. Scand. (in press)
5. Armitage D.H., Gardiner S.J.: Classical potential theory, Springer Monographs in Mathematics. Springer, London Berlin Heidelberg (2001)