@article{VMJ_2019_21_4_a7,
     author = {E. I. Gordon},
     title = {I.~I.~Gordon who was an adressee of {L.~S.~Pontryagin} (introductory notes)},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {90--98},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2019_21_4_a7/}
}