Das, Sourav, Subba Rao, Tata, and Boshnakov, Georgi N. (2020) An asymptotically unbiased weighted least squares estimation criterion for parametric variograms of second order stationary geostatistical processes. Communications in Statistics: simulation and computation, 49 (7). pp. 1839-1854.

Rao, Tata Subba, Das, Sourav, and Boshnakov, Georgi N. (2014) A frequency domain approach for the estimation of parameters of spatio-temporal stationary random processes. Journal of Time Series Analysis, 35 (4). pp. 357-377.