Cellular mechanisms of multidrug resistance of tumor cells https://www.researchgate.net/profile/Alla-Stavrovskaya/publication/12612354_Cellular_Mechanisms_of_Multidrug_Resistance_of_Tumor_Cells/links/0912f50643a0c09725000000/Cellular-Mechanisms-of-Multidrug-Resistance-of-Tumor-Cells.pdf