V. P. Smili͡anskiĭ

• T͡Sentralʹnai͡a i bokovai͡a zadachi svi͡azi dli͡a obyknovennykh lineĭnykh different͡sialʹnykh uravneniĭ s irreguli͡arnoĭ osoboĭ tochkoĭ