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vol9no8pp246_268_614942.pdf
vol8no5pp142_172_911939.pdf
vol10no5pp169_172_161128.pdf
vol10no10pp357_367_335608.pdf
vol10no10pp368_395_703269.pdf
vol10no10pp396_401_164345.pdf
vol8no7pp230_236_186001.pdf
vol8no8pp256_266_309070.pdf