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Area-filling curves

In this paper we study area-filling curves, i.e. continuous and injective mappings defined on [0,1] whose graph has positive measure. Current literature calls them ``Osgood curves", but their invention is due to H. Lebesgue. Stromberg and Tseng constructed homogeneous area-filling curves and offered an elegant example. We show that an appropriate variant of Knopp's construction attains the same homogeneity result. In Section 4 we discuss briefly the existence of an ``invasive" curve, i.e. a continuous and injective mapping from the half-open interval [0,1[ to the unit square, whose image has measure 1. In the last section we discuss several aspects of the Lance-Thomas curve, connecting it with the other construction due to Stromberg and Tseng.