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1998
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M. A. Pankov, “Projections of $k$-dimensional subsets of $\mathbf R^n$ onto $k$-dimensional planes”, Mat. Fiz. Anal. Geom., 5:1/2 (1998), 114–124
1997
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M. A. Pankov, E. A. Polulyakh, “Critical Points of Arbitrary Mappings of $\mathbb{R}^n$ into $\mathbb{R}^m$”, Funktsional. Anal. i Prilozhen., 31:3 (1997), 82–85; Funct. Anal. Appl., 31:3 (1997), 214–216