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https://doi.org/10.1142/S0219199713500132
https://doi.org/10.1142/S0219199713500168
https://doi.org/10.1142/S0219199713500193
https://doi.org/10.1142/S021919971350020X
https://doi.org/10.1142/S0219199713500235
https://doi.org/10.1142/S021919971350051X