@Article{69495,
     author = "Ryszard Ergetowski",
     title = "Epistolarna spuścizna J. K. Plebańskiego ",
     year =  1974,
     volume =  19,
     number =  2,
     journal =  Kwartalnik Historii Nauki i Techniki,
     pages =  s. 321-330,
    }