@article{10_4064_am_21_1_1_14,
     author = {Wiojciech Wajda},
     title = {Limit theorems for nonhomogeneous {semi-Markov} processes},
     journal = {Applicationes Mathematicae},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1991},
     doi = {10.4064/am-21-1-1-14},
     zbl = {0741.60090},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-21-1-1-14/}
}