1. Solid State Phys., Suppl. 7 (1966).
2. and , Proc. VI. Internat. Conf. Positron Annihilation, Ed. , and , North-Holland Publ. Co., Amsterdam 1982 (p. 640).
3. , , and , Proc. VII. Internat. Conf. Positron Annihilation, Ed. , and , World Sci. Publ. Co. Pte. Ltd., Singapore 1985 (p. 733).
4. Effect of doping on positron lifetime in Si crystals