Unilateral tilings of the plane with squares of three sizes.
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Martini, Horst, Makai, Endre, Soltan, Valeriu (1998)
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Two direct relations are exhibited between the Whitehead product for track groups studied in [4] and the generalized Whitehead product in the sense of Arkowitz. The problem of determining the order of the Whitehead square is posed and some computations given.
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