@article{INTM_1980_18_a3,
     author = {R. R. Akhmerov and M. I. Kamenskii and A. S. Potapov and B. N. Sadovskii},
     title = {Condensing operators},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {185--250},
     publisher = {mathdoc},
     volume = {18},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1980_18_a3/}
}