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ATTSTROM R, 1970, Journal of Periodontal Research, V5, P42, DOI 10.1111/j.1600-0765.1970.tb01836.x
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ATTSTROM R, 1971, Journal of Periodontal Research, V6, P194, DOI 10.1111/j.1600-0765.1971.tb00609.x
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ATTSTROM R, 1970, Journal of Periodontal Research, V5, P48, DOI 10.1111/j.1600-0765.1970.tb01837.x
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ATTSTROM R, 1971, Journal of Periodontal Research, V6, P110, DOI 10.1111/j.1600-0765.1971.tb00596.x
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HELLDEN L, 1973, SCAND J DENT RES, V81, P123