![Balthasar Van der Pol, horoscope for birth date 27 January 1889, born in Utrecht, with Astrodatabank biography" Balthasar Van der Pol, horoscope for birth date 27 January 1889, born in Utrecht, with Astrodatabank biography"](https://www.astro.com/imwiki/adb/nat/I078/I078944.vOvSJ_o_zqXgN4hww3f.uw.c2atw.250.jpg)
Balthasar Van der Pol, horoscope for birth date 27 January 1889, born in Utrecht, with Astrodatabank biography"
![File:Prof. Dr. Balthasar van der Pol (1889-1959). Gouden promotiefeest Lorentz 1925 (cropped) (cropped).jpg - Wikipedia File:Prof. Dr. Balthasar van der Pol (1889-1959). Gouden promotiefeest Lorentz 1925 (cropped) (cropped).jpg - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/0/05/Prof._Dr._Balthasar_van_der_Pol_%281889-1959%29._Gouden_promotiefeest_Lorentz_1925_%28cropped%29_%28cropped%29.jpg)
File:Prof. Dr. Balthasar van der Pol (1889-1959). Gouden promotiefeest Lorentz 1925 (cropped) (cropped).jpg - Wikipedia
![On relaxation-oscillations in The London, Edinburgh, and Dublin Philosophical Magazine 2 pp. 978-992, 1926 | Balthasar van der Pol | 1st Edition On relaxation-oscillations in The London, Edinburgh, and Dublin Philosophical Magazine 2 pp. 978-992, 1926 | Balthasar van der Pol | 1st Edition](https://atticusrarebooks.cdn.bibliopolis.com/pictures/1126_1.jpg?auto=webp&v=1542490513)
On relaxation-oscillations in The London, Edinburgh, and Dublin Philosophical Magazine 2 pp. 978-992, 1926 | Balthasar van der Pol | 1st Edition
![On relaxation-oscillations in The London, Edinburgh, and Dublin Philosophical Magazine 2 pp. 978-992, 1926 by van der Pol, Balthasar: (1926) 1st Edition. | Atticus Rare Books On relaxation-oscillations in The London, Edinburgh, and Dublin Philosophical Magazine 2 pp. 978-992, 1926 by van der Pol, Balthasar: (1926) 1st Edition. | Atticus Rare Books](https://pictures.abebooks.com/inventory/30060205727_2.jpg)