Nonlinear potential theory of degenerate elliptic equations - Heinonen, Juha 1960-2007; Kilpeläinen, Tero; Martio, Olli (Dover Publications, Inc., 2018)
Originally published: New York : Oxford University Press, 1993. Dover edition first published in 2006 and reissued in 2018. Dover edition has a new preface, corrigenda, and epilogue consisting of other new material