au.\*:("VOROPINOV J")
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THE PROBLEM OF COHESION IN VIEW OF ROCK DRILLABILITY.VOROPINOV J.1967; POLSKA.AKAD. NAUK.ODDZ. KRAKOW.PRACE.KOM.NAUK.TECHN.GORNICTWO; POL; 1967, NUM. 0004, P. 21 A 39Miscellaneous
METHODES DE TERRAIN POUR LA CLASSIFICATION DES ROCHES COHERENTES DANS LES FORAGES.VOROPINOV J; BROUL J.1969; GEOL. PRUZK.; CSK; 1969, NUM. 0005, P. 133 A 136Miscellaneous
