Eftimi, R. Point dilution method of a radioactive tracer, applied for the assessment of the fractured zone in Valias coal mine. София: 1999 p. 8-12,.
Eftimi, R. Point dilution method of a radioactive tracer, applied for the assessment of the fractured zone in Valias coal mine. София: 1999 p. 8-12,.
Eftimi, R. (1999) Point dilution method of a radioactive tracer, applied for the assessment of the fractured zone in Valias coal mine, София: p. 8-12,.
Eftimi, R. (1999). Point dilution method of a radioactive tracer, applied for the assessment of the fractured zone in Valias coal mine. София: p. 8-12.
Eftimi R. Point dilution method of a radioactive tracer, applied for the assessment of the fractured zone in Valias coal mine. София: 1999. p. p. 8-12.