| On the uniqueness of generalized and quasi-regular solutions to equations of mixed type in ℝ3 TD Hristov, NI Popivanov, M Schneider Siberian Advances in Mathematics 21, 262-273, 2011 | 30 | 2011 |
| On the existence and uniqueness of a generalized solution of the Protter problem for -D Keldysh-type equations N Popivanov, T Hristov, A Nikolov, M Schneider Boundary Value Problems 2017, 1-30, 2017 | 29 | 2017 |
| Singular solutions to Protter’s problem for a class of 3-D weakly hyperbolic equations T Hristov, N Popivanov Compt. Rend. Acad. Bulg. Sci 60 (7), 719-724, 2007 | 29 | 2007 |
| Mathematical and computer modeling of COVID-19 transmission dynamics in Bulgaria by time-depended inverse SEIR model S Margenov, N Popivanov, I Ugrinova, S Harizanov, T Hristov AIP Conference Proceedings 2333 (1), 2021 | 27 | 2021 |
| Singular solutions to Protter's problem for the 3-D wave equation involving lower order terms. M Grammatikopoulos, TD Hristov, NI Popivanov Electronic Journal of Differential Equations (EJDE)[electronic only] 2003 …, 2003 | 23 | 2003 |
| Singular Solutions to a (3+ 1)‐D Protter‐Morawetz Problem for Keldysh‐Type Equations N Popivanov, T Hristov, A Nikolov, M Schneider Advances in Mathematical Physics 2017 (1), 1571959, 2017 | 22 | 2017 |
| AIP Conference Proceedings T Hristov, N Popivanov, M Schneider American Institute of Physics, Melville, NY 1631, 255-262, 2014 | 19 | 2014 |
| Mathematical Modeling and Short-Term Forecasting of the COVID-19 Epidemic in Bulgaria: SEIRS Model with Vaccination S Margenov, N Popivanov, I Ugrinova, T Hristov Mathematics 10 (15), 2570, 2022 | 17 | 2022 |
| Singular solutions to Protter problem for Keldysh type equations T Hristov AIP Conference Proceedings 1631 (1), 255-262, 2014 | 12 | 2014 |
| Estimates of singular solutions of Protter's problem for the 3-D hyperbolic equations TD Hristov, NI Popivanov, M Schneider Communications in Applied Analysis 10 (2-3), 223-252, 2006 | 8 | 2006 |
| Generalized solutions of Protter problem for (3+ 1)-D Keldysh type equations T Hristov, A Nikolov, N Popivanov, M Schneider AIP Conference Proceedings 1789 (1), 2016 | 7 | 2016 |
| On uniqueness of quasi-regular solutions to Protter problem for Keldish type equations TD Hristov, NI Popivanov, M Schneider AIP Conference Proceedings 1570 (1), 321-326, 2013 | 7 | 2013 |
| Protter problem for 3-D Keldysh type equations involving lower order terms T Hristov, N Popivanov, M Schneider AIP Conference Proceedings 1690 (1), 2015 | 6 | 2015 |
| Generalized solutions to Protter problems for 3-D Keldysh type equations T Hristov, N Popivanov, M Schneider AIP Conference Proceedings 1637 (1), 422-430, 2014 | 6 | 2014 |
| Proceedings of the Forty First Spring Conference of the Union of Bulgarian Mathematicians T Hristov, N Popivanov, M Schneider Math. and Education in Math 41, 173-179, 2012 | 6 | 2012 |
| On the singularities of 3-D Protter's problem for the wave equation MK Grammatikopoulos, TD Hristov, NI Popivanov Southwest Texas State University, Department of Mathematics, 2001 | 5 | 2001 |
| Differential and Time-Discrete SEIRS Models with Vaccination: Local Stability, Validation and Sensitivity Analysis Using Bulgarian COVID-19 Data S Margenov, N Popivanov, I Ugrinova, T Hristov Mathematics 11 (10), 2238, 2023 | 4 | 2023 |
| Behaviour of singular solutions to Protter problem for (3+ 1)-D Keldysh type equations T Hristov, A Nikolov Comptes rendus de l'Académie bulgare des Sciences 70 (2), 167-175, 2017 | 4 | 2017 |
| Parameters identification and forecasting of COVID-19 transmission dynamics in Bulgaria with mass vaccination strategy S Margenov, N Popivanov, I Ugrinova, S Harizanov, T Hristov AIP Conference Proceedings 2505 (1), 2022 | 3 | 2022 |
| An innovative model for integrating electronic assessment into differential equations education T Hristov AIP Conference Proceedings 2048 (1), 2018 | 3 | 2018 |
Nedyu PopivanovProfessor of Mathematics, Sofia University在 fmi.uni-sofia.bg 的电子邮件经过验证
