1. G. Bantle, An Asymptotic Formula for B- twins, Acta Arith., 47 (1986), 297–312.
2. G. Bande, Untere Abschätzung fier die Anzahl der B- Zwillinge auf Kurzen Intervallen, Acta kith., 46 (1986), 313–329.
3. H. Halberstam and H. -B. Richert, Sieve methods, Academic Press, London, 1974.
4. C. Hooley, On the intervals between numbers that are sums of two squares III, J. Reine Angew. Math., 267 (1974), 207–218.
5. M. N. Huxley, Large values of Dirichlet polinomials III, Acta Arith., 26 (1974), 431–440.