Geodesic
Some Problems on Motion, Simple but ...
Matematičeskoe obrazovanie, no. 1 (2005), pp. 66-77 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let some points of a figure (say, ends of a segment) move along some prescribed trajectories (say, along sides of a right angle). How do other points (say, the middle of the segment) move? Similar geometric problems are studied in the paper. 
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     author = {S. V. Dvoryaninov},
     title = {Some {Problems} on {Motion,} {Simple} but ...},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {66--77},
     year = {2005},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2005_1_a3/}
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S. V. Dvoryaninov. Some Problems on Motion, Simple but .... Matematičeskoe obrazovanie, no. 1 (2005), pp. 66-77. http://geodesic.mathdoc.fr/item/MO_2005_1_a3/