Auscher, Pascal; Hofmann, Steve; Lacey, Michael; McIntosh, Alan; Tchamitchian, Philippe (2002). «The solution of the Kato square root problem for second order elliptic operators on Rn». Annals of Mathematics. 156 (2): 633–654. MR1933726. doi:10.2307/3597201
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Auscher, Pascal; Hofmann, Steve; Lacey, Michael; McIntosh, Alan; Tchamitchian, Philippe (2002). «The solution of the Kato square root problem for second order elliptic operators on Rn». Annals of Mathematics. 156 (2): 633–654. MR1933726. doi:10.2307/3597201