(1994) ON STRONG ERGODICITY FOR NONHOMOGENEOUS CONTINUOUS-TIME MARKOV-CHAINS (1994) ON THE ERGODICITY OF NONHOMOGENEOUS BIRTH AND DEATH PROCESSES (1995) ON THE ESTIMATION OF PROBABILITIES FOR BIRTH AND DEATH PROCESSES (1991) SOME ESTIMATES OF THE RATE OF CONVERGENCE FOR BIRTH AND DEATH PROCESSES (1998) STABILITY OF BIRTH-AND-DEATH PROCESSES (1991) STABILITY OF CONTINUOUS-TIME NONHOMOGENEOUS MARKOV-CHAINS (1991) STABILITY OF NONHOMOGENEOUS MARKOV CHAINS WITH CONTINUOUS TIME (1997) THE DECAY FUNCTION OF NONHOMOGENEOUS BIRTH-DEATH PROCESSES, WITH APPLICATION TO MEAN-FIELD MODELS (1995) UPPER AND LOWER BOUNDS ON THE RATE OF CONVERGENCE FOR NONHOMOGENEOUS BIRTH AND DEATH PROCESSES | 
