Bouchet, L., Amestoy, P., Buttari, A., Rouet, F., & Chauvin, M. (2013). Simultaneous analysis of large INTEGRAL/SPI11Based on observations with INTEGRAL, an ESA project with instruments and science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Spain, and Switzerland), Czech Republic and Poland with participation of Russia and the USA. datasets: Optimizing the computation of the solution and its variance using sparse matrix algorithms. Astronomy and computing, 1, 59-69. https://doi.org/10.1016/j.ascom.2013.03.002

Bouchet, L., P. Amestoy, A. Buttari, F.-H Rouet, a M. Chauvin. "Simultaneous Analysis of Large INTEGRAL/SPI11Based on Observations with INTEGRAL, an ESA Project with Instruments and Science Data Center Funded by ESA Member States (especially the PI Countries: Denmark, France, Germany, Italy, Spain, and Switzerland), Czech Republic and Poland with Participation of Russia and the USA. Datasets: Optimizing the Computation of the Solution and Its Variance Using Sparse Matrix Algorithms." Astronomy and Computing 1 (2013): 59-69. https://doi.org/10.1016/j.ascom.2013.03.002.

Bouchet, L., et al. "Simultaneous Analysis of Large INTEGRAL/SPI11Based on Observations with INTEGRAL, an ESA Project with Instruments and Science Data Center Funded by ESA Member States (especially the PI Countries: Denmark, France, Germany, Italy, Spain, and Switzerland), Czech Republic and Poland with Participation of Russia and the USA. Datasets: Optimizing the Computation of the Solution and Its Variance Using Sparse Matrix Algorithms." Astronomy and Computing, vol. 1, 2013, pp. 59-69, https://doi.org/10.1016/j.ascom.2013.03.002.