%0 Journal Article %A A. A. Ageev %A A. V. Pyatkin %T A 2-approximation algorithm for the metric 2-peripatetic salesman problem %J Diskretnyj analiz i issledovanie operacij %D 2009 %P 3-20 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DA_2009_16_4_a0/ %G ru %F DA_2009_16_4_a0