conference paper published in 1987

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conference paper published in 1991

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conference paper published in 2017

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conference paper published in 1989

conference paper published in 1990

conference paper published in 1988

conference paper published in 1988

conference paper published in 1990

scientific article published in September 1990

conference paper published in 1988

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conference paper published in 1986

conference paper published in 1988

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conference paper published in 1988

conference paper published in 1989