Celebratio Mathematica

J. Bor­cea, P. Brändén, and T. M. Lig­gett: “Neg­at­ive de­pend­ence and the geo­metry of poly­no­mi­als,” J. Am. Math. Soc. 22 : 2 (2009), pp. 521–​567. MR 2476782 Zbl 1206.​62096 ArXiv 0707.​2340 article

T. M. Lig­gett and A. Vanden­berg-Rodes: “Sta­bil­ity on $\{0,1,2,\dots {\}}^S$: Birth-death chains and particle sys­tems,” pp. 311–​329 in No­tions of pos­it­iv­ity and the geo­metry of poly­no­mi­als: Ded­ic­ated to the memory of Ju­li­us Bor­cea. Edi­ted by P. Brändén, M. Pas­sare, and M. Putin­ar. Trends in Math­em­at­ics. Birkhäuser (Basel), 2011. MR 3051173 Zbl 1278.​60144 ArXiv 1009.​4899 incollection