• Some approximate Gauss–Newton-type methods for nonlinear ill-posed problemsKangro, Inga; Kangro, Raul; Vaarmann, OtuProceedings of the Estonian Academy of Sciences2013 / p. 227-237 https://artiklid.elnet.ee/record=b2651797*est https://doi.org/10.3176/proc.2013.4.03 https://www.scopus.com/sourceid/11500153303 https://www.scopus.com/record/display.uri?eid=2-s2.0-84887846445&origin=resultslist&sort=plf-f&src=s&sot=b&sdt=b&s=DOI%2810.3176%2Fproc.2013.4.03%29&sessionSearchId=ca1c4c3d1ca2afc60494b607dc7f4b32 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=P%20EST%20ACAD%20SCI&year=2013 https://www.webofscience.com/wos/woscc/full-record/WOS:000327478600003
• Some iterative regularized methods for highly nonlinear least squares problemsKangro, Inga; Vaarmann, OtuMathematical modelling and analysis2009 / 2, p. 179-186 https://www.tandfonline.com/doi/abs/10.3846/1392-6292.2009.14.179-186
• Two-parameter regularized Gauss-Newton type methods for highly nonlinear least squares problemsKangro, Inga; Vaarmann, OtuInternational Conference : 20th EURO Mini Conference "Continuous Optimization and Knowledge-based Technologies" (EurOPT-2008) : May 20-23, 2008, Neringa, Lithuania2008 / p. 160-164 https://www.researchgate.net/publication/228469128_Two-parameter_regularized_Gauss-Newton_type_methods_for_highly_nonlinear_least_squares_problems