@article{MAIS_2018_25_4_a1,
     author = {M. S. Ushakova and A. I. Legalov},
     title = {Verification of programs with mutual recursion in the {Pifagor} language},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {358--381},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2018_25_4_a1/}
}