Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Place | Race winners | GP winner | Source |
| --- | --- | --- | --- | --- |
| 1 April | Frauenfeld | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 19 May | Chernivtsi | Valentin Giraud / Nicolas Musset | Etienne Bax / Kaspars Stupelis | Result |
| 19 May | Chernivtsi | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 26 May | Schwedt | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 9 June | Kramolín | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 16 June | Varsseveld | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 23 June | Genk | Valentin Giraud / Nicolas Musset | Ben Adriaenssen / Ben van de Bogaart | Result |
| 23 June | Genk | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van de Bogaart | Result |
| 7 July | Iffendic | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 21 July | Strassbessenbach | Etienne Bax / Kaspars Stupelis | Ben Adriaenssen / Ben van den Bogaart | Result |
| 21 July | Strassbessenbach | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 4 August | Kiviõli | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 11 August | Ķegums | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 18 August | Roggenburg | Etienne Bax / Kaspars Stupelis | Ben Adriaenssen / Ben van den Bogaart | Result |
| 18 August | Roggenburg | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 8 September | Dardon Guegnon | Etienne Bax / Kaspars Stupelis | Ben Adriaenssen / Ben van den Bogaart | Result |
| 8 September | Dardon Guegnon | Ben Adriaenssen / Ben van den Bogaart | Ben Adriaenssen / Ben van den Bogaart | Result |
| 15 September | Rudersberg | Ben Adriaenssen / Ben van den Bogaart | Jan Hendrickx / Elvijs Mucenieks | Result |
| 15 September | Rudersberg | Jan Hendrickx / Elvijs Mucenieks | Jan Hendrickx / Elvijs Mucenieks | Result |
| 22 September | Nismes | Etienne Bax / Kaspars Stupelis | Etienne Bax / Kaspars Stupelis | Result |
| 13 October | Cingoli | not held | not held | not held |
Question:
What source has a race winner of ben adriaenssen / ben van den bogaart, and the gp winner of ben adriaenssen / ben van den bogaart, for the date of 1 april?
Answer:
Result