METHOD OF CONSTRUCTING CAST-IN-PLACE PILES WITH EXPANDED BOTTOM PORTIONS von TULCHINSKIJ MIKHAIL D,SU, LEJTGOLD ANATOLIJ E,SU, SUMAROKOV OLEG M,SU, MALITSKIJ EDUARD B,SU, NIKITIN VIKTOR V,SU, PORYVKIN MIKHAIL N,SU, GELFGAT ALEKSANDR M,SU

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