# A Three-Dimensional Pen-Like Ultrasonic Positioning System Based on Quasi-Spherical PVDF Ultrasonic Transmitter

> Research article (IEEE Sensors Journal, 2020) · cited 15× · AI/ML

**Wikidata**: [openalex:W3049372854](https://www.wikidata.org/wiki/openalex:W3049372854)  
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