6
Published in 1997
doi: 10.1016/S0883-2927(96)00063-7
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conference paper or compendium article online
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10
Published in 1991
doi: 10.1127/ejm/3/5/0899
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15
Published in 1998
doi: 10.1016/S0375-6742(97)00065-4
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