@article{21651, author = {Alfred Carasso}, title = {Reconstructing the past from imprecise knowledge of the present: Some examples of non uniqueness in solving parabolic equations backward in time.}, year = {2012}, number = {36}, month = {2012-05-24}, publisher = {Siam Journal on Numerical Analysis}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908242}, language = {en}, }