Eidukevičius, Rimantas, and Dainius Characiejus. “Statistical Analysis and Mathematical Modeling of Primary and Secondary Tumors Growth in ‘concomitant Immunity’ Model”. Lietuvos Matematikos Rinkinys, vol. 37, no. I, Dec. 1997, pp. 261–267 , https://doi.org/10.15388/LMD.1997.38233.