@article{DAN_1978_239_4_a5,
     author = {A. P. Kombarov},
     title = {On tightness and normality of $\Sigma$-products},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     publisher = {mathdoc},
     volume = {239},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_4_a5/}
}