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Link to original content: https://dblp.uni-trier.de/rec/journals/endm/GlazkovBGCP06.xml
Yury Glazkov Alexey Baburin Edward Gimadi Federico Della Croce Vangelis Th. Paschos Approximation algorithms for 2-Peripathetic Salesman Problem with edge weights 1 and 2. 35-36 2006 27 Electron. Notes Discret. Math. https://doi.org/10.1016/j.endm.2006.08.043 db/journals/endm/endm27.html#GlazkovBGCP06