Geodesic
Transference inequalities for multiplicative Diophantine exponents
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Classical and modern mathematics in the wake of Boris Nikolaevich Delone, Tome 275 (2011), pp. 227-239

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We prove inequalities for multiplicative analogues of Diophantine exponents; these inequalities are similar to the ones known in the classical case. Particularly, we show that a matrix is badly approximable if and only if its transpose is badly approximable and establish some inequalities connecting multiplicative exponents with ordinary ones. 
@article{TM_2011_275_a14,
     author = {Oleg N. German},
     title = {Transference inequalities for multiplicative {Diophantine} exponents},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {227--239},
     publisher = {mathdoc},
     volume = {275},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_275_a14/}
}
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Oleg N. German. Transference inequalities for multiplicative Diophantine exponents. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Classical and modern mathematics in the wake of Boris Nikolaevich Delone, Tome 275 (2011), pp. 227-239. http://geodesic.mathdoc.fr/item/TM_2011_275_a14/