In 1999, when Kochina was 100 years old, she published Some properties of a fractional-linear transformation written jointly with N N Kochina.
Sa 1999, kapag Kochina ay 100 years old, siya nai-publish ilang mga pag-aari ng isang fractional-guhit-iibang-anyo nakasulat na sama-sama sa nn Kochina.