@article{JMAG_2003_10_3_a1,
     author = {Yuri Lyubich},
     title = {Sturm{\textendash}Liouville problem with a distributed condition},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {290--300},
     year = {2003},
     volume = {10},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2003_10_3_a1/}
}