*Mayhaps for balloons valbal https://www.xsens.com/images/stories/PDF/drift-free%20dynamic%20height%20sensor%20using%20mems%20imu%20aided%20by%20mems%20pressure%20sensor.pdf
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*Not very good, but mentions rockets http://home.earthlink.net/~david.schultz/rnd/2004/KalmanApogeeII.pdf
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*Really cool, but way too OP http://tid.uio.no/~jankbe/Filer/PhD_JKB_200207.pdf