$a Kp. Szkice o ruchach ciał niebieskich / W. W. Bielecki. - Warszawa, 1976.
670
$a Kp. Očerki o dviženii kosmičeskih tel / V. V. Beleckij. - Izd. 2-oe, ispr. i dop. - Moskva, 1977.
670
$a Essays on the motion of celestial bodies / V. V. Beletsky. - Basel, 2001. $b (Keldysh Institute of Applied Mathematics, Russian Academy of Science, Moscow, Russia)