@article{MM_1991_3_6_a4,
     author = {P. D. Shirkov},
     title = {Numerical methods of calculations for chemical and ionic equilibrium},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {42--60},
     year = {1991},
     volume = {3},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1991_3_6_a4/}
}